I feel like the fundamental issue here is the notion that taking a newborn baby to work is "inappropriate". Unless the job involves hygiene or health and safety issues, there is no reason why a woman shouldn't be able to take her breastfed baby to work with her. It's a cultural construct borne of an outdated patriarchal society with unnecessary formalities that don't empower us. She's sitting on a sofa all day listening to people talk. My only concern would be a flat place for the infant to lie down.
When I started my MSc, one of the lecturers took her baby in. The department has a rep for being very child friendly and other members of staff would have their older children in with them if they were off school with a holidays clash, etc. It wasn't uncommon for kids to be playing Lego or dinosaurs in random places. They weren't allowed in the labs, but that was about it. I remember at my village primary, when one of my teacher's children was off sick, they had to sit in the corner of our classroom with nothing to do. That was inappropriate.
I really don't see the issue with a little baby being with its mother if it's breastfed. Pumping every 2-3 hours for 20-30 mins is more disruptive.
Sometimes childcare can't or won't take a child because they're sick. A lot of places in the UK have differing minimum ages they'll take babies from as it's assumed someone gets parental leave. And differing times they open from and to. And maximum capacity.
If men in the commons had to take their babies to work sometimes, maybe they'd have some empathy and understanding. They're not being more professional, they're in a privileged position where they can just walk away from their child every day knowing "someone else will deal with them", and their reputation remains intact at work.
I am confused though, didn't Luciana Berger get mat leave a few years ago?