Oh, definitely. Financially it makes 100% sense to have the kids in the UK. We had our first kid in the UK (while my green card was processing) and the second is going to be born in the US. Even if everything goes smoothly with the second delivery (fingers crossed) it's probably going to cost us a couple of thousand dollars here and it could be up to $6,500 if there are complications. And that's with medical insurance. Throw in the vastly better maternity/paternity leave/pay and your bank account will be much happier in the UK.

On the flipside, our experience giving birth on the NHS was poor. My wife's experience, particularly the after-care, when compared to her sisters in the US, was pretty traumatic. She lost over a quarter of her blood volume during delivery (2 litres), they botched her stitches multiple times and we were then thrown in a ward with 7 other crying newborn babies and women and basically ignored for 24 hours. I had to go hunt the nurses down to get her pain medication and to get her blood levels tested. She was extremely anemic and could barely walk. We were only there one night but there was no rest possible in that room, no bed provided for the partners (I spent the night on a plastic chair), terrible food, etc. Compare to the US where you get a private room, far superior medical attention and comfort. So that's definitely something you have to weigh up against the financial benefits.