Why ‘War’ Wrote Serena Byrne Actress Phoebe Fox’s Real Life Pregnancy into the HBO Show (But Kept Sienna Miller’s Recent Pregnancy Under Wraps)

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Why ‘War’ Wrote Serena Byrne Actress Phoebe Fox’s Real Life Pregnancy into the HBO Show (But Kept Sienna Miller’s Recent Pregnancy Under Wraps). (2026, October 16). New York Post. https://decider.com/2026/10/15/war-on-hbo-is-serena-pregnant-how-phoebe-fox-sienna-miller-real-life-pregnancy/

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New York Post · collected 2026-10-16 · by mliss1578

Quick Summary

In HBO's legal drama "War," actress Phoebe Fox revealed her real-life pregnancy to creator George Kay mid-season filming, leading to Serena Byrne's character becoming pregnant. This decision contrasts with Sienna Miller's undisclosed pregnancy during the same period, highlighting a rare instance of on-screen representation for pregnant women in television. The show normalized this by subtly incorporating Fox’s cravings and wardrobe changes without making it the central plot point, unlike Miller’s case where such inclusion was not pursued due to storyline constraints.
Written locally by qwen2.5:14b on 2026-10-16, using this article's own text rather than the other coverage of the same event (that is the story summary below).

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Story summary

In HBO's new legal drama War, actress Phoebe Fox revealed she was pregnant, which wasn't initially part of the show's plan for her character Serena Byrne. Despite this change, the series creators decided to incorporate her pregnancy into the storyline as the season progressed. Sienna Miller, who stars alongside Fox in the show, confirmed that her own pregnancy would not have worked with both women being visibly pregnant at the same time.

The decision to include Phoebe Fox's real-life pregnancy was made after discussions between Fox and series creator George Kay. Fox wanted to normalize pregnancy for female characters on TV, noting it is rare to see a woman on screen who is pregnant without that fact being central to her story. Her character Serena Byrne’s pregnancy became noticeable in later episodes of the first season as she continued working at the law firm.

DECIDER reported Phoebe Fox's comments about wanting to normalize pregnancy for women on TV, emphasizing realism and representation rather than making it a focal point of the storyline.

Written for “Serena Byrne War Pregnancies Controversy” on 2026-10-16, grounded in this article and the 0 other(s) covering the same event.
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Story

📰 Serena Byrne War Pregnancies Controversy
Entertainment · 1 article(s) covering the same event.

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Claims extracted
34
sentences that state something as happening or true
Uncertain
15%
5 of 34 hedged ("reportedly", "may", "according to")
Leaning
not political
takes no side on a contested political question
Publisher signals
67/100
New York Post's corrections and hedging, across everything collected from it. Not a measure of accuracy.
Outlets on this story
1
Entertainment
Same framing elsewhere
1
articles that frame the event the way this one does
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New York Post · 10708 article(s) · 30 correction(s) detected
Running correction rate · 30 correction(s)

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No reporter is named on this article, beyond the feed's “mliss1578”.

Topics

DECIDER Fargo War War Season 1

Subjects

Serena PERSON · 5× Fox PERSON · 4× Phoebe Fox PERSON · 3× Sienna Miller PERSON · 3× Carla PERSON · 2× DECIDER ORG · 2× Dominic West PERSON · 2× Miller PERSON · 2× Phoebe PERSON · 2× Sienna PERSON · 2×

Narrative

(And jackets are baggier than they necessarily need to be.) Sienna Miller confirmed to DECIDER that “Phoebe got in there earlier than I did by saying she was pregnant,” but she now doesn’t know “if it would have worked” to have both Serena and her client Carla pregnant at the same time in War Season 1.
framing: assertive · carried by 1 article(s) · first seen 2026-10-16
🔮 We could hide it,” Phoebe Fox told DECIDER.

Claims (34 extracted, 5 hedged)

new legal drama War relishes in upending our expectations at every turn. asserted
drama → relish → turn
Case in point: it’s not immediately apparent that bullish attorney Serena Byrne (Phoebe Fox) is pregnant when we meet her all the way back in Episode 1. asserted
we → ’ → Episode
However, as the series goes on — and Carla Duval (Sienna Miller) and Morgan Henderson’s (Dominic West) divorce intensifies — Serena’s bump steadily grows under her chic designer office wear. asserted
bump → go → wear
Serena’s pregnancy wasn’t originally part of series creator George Kay‘s plan for the character, but came about when star Phoebe Fox revealed that she and her husband, Slow Horses Season 6 breakout star Kyle Soller, were expecting their first child. asserted
she → come → child
“I talked about it with George [Kay] and they very much left it up to me: Did I want to have it written in? asserted
it → talk → me
We could hide it,” Phoebe Fox told DECIDER. uncertain
Fox → hide → DECIDER
“You know, that was my choice.” asserted
that → know → ?
“And I said, ‘Look, it’s so rare to see a character on TV, a woman who is pregnant, and it is not the story.’ asserted
it → say → TV
Fargo is really the only example I can come up with,” Fox added. asserted
Fox → come → ?
“I think it’s really important for women to see that and to have it normalized. asserted
it → think → that
I wanted to really look after her pregnancy and make sure it felt realistic without giving it too much air time, honestly.” asserted
it → want → time
“The other secret, I’m not sure you know, but we’re now allowed to talk about is that Sienna was also pregnant in parallel,” War director Ben Taylor revealed. asserted
Taylor → ’m → parallel
“So she asked, ‘Could you write it in?’ and we had already said yes to Phoebe, so.” uncertain
we → ask → Phoebe
“You can’t have all the characters —” George Kay said. asserted
Kay → have → characters
“You can’t all be pregnant and so with Sienna it was like the classic blocking where there’s handbags being held and desks are higher than perhaps they should be.” asserted
they → ’ → blocking
(And jackets are baggier than they necessarily need to be.) Sienna Miller confirmed to DECIDER that “Phoebe got in there earlier than I did by saying she was pregnant,” but she now doesn’t know “if it would have worked” to have both Serena and her client Carla pregnant at the same time in War Season 1. asserted
Serena → need → Season
“Obviously we were both actually pregnant in the filming of this,” Miller said. asserted
Miller → say → this
“I think for [Morgan] to divorce [Carla] pregnant would be, would be really —” “Well, this [could be] someone else’s baby,” Dominic West suggested. uncertain
West → think → Carla
“That’s true,” Miller said. asserted
Miller → ’ → ?
“They could have had fun with it… uncertain
They → have → it
But it was nice both being pregnant on set because we could commiserate and share chocolate.” uncertain
we → commiserate → chocolate
In fact, if you notice that Serena has a particular penchant for snacking in Season 1, that also came organically from Fox’s pregnancy. asserted
that → notice → pregnancy
“I said to George, ‘Look, all I think about all day is snacks. asserted
I → say → George
All day,'” Fox said. asserted
Fox → say → ?
“So I say, ‘Look, I want to snack all the time. asserted
I → say → ?
I think let’s put that in there.'” asserted
’s → think → that
As War Season 1 continues, you’ll notice the natural evolution of Serena’s pregnancy, which was ironically difficult to capture because of the out-of-chronological order logistics of television production. asserted
which → continue → production
They couldn’t rely upon prosthetics for continuity. asserted
They → rely → continuity
“This probably doesn’t reflect well on me, but I did investigate the concept of a prosthetic to sit on top of a bump. asserted
I → reflect → bump
And we spoke to prosthetic designers and they said, ‘We’d never do that because it’s too dangerous,'” Taylor said. asserted
Taylor → speak → that
“So we sort of just went for it. asserted
we → go → it
And we’d occasionally get notes from HBO and Sky, and it just meant that you went tighter coverage to hide it. asserted
you → get → it
But for the most part, you went with it and Matt, the costume designer, sort of embellished it. asserted
Matt → go → it
New episodes of War premiere on HBO and HBO Max at 9 PM ET on Thursdays. asserted
episodes → premiere → Thursdays
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