I was a Sahm too, with a very part time job. I was probably lucky in the benefit of hindsight as I'd already established a reasonably well-paid career. However, I didn't expect, or get, help. It was a choice, pure and simple. I bore the cost, and was happy to.
I think nowadays there IS a sense of entitlement to "having it all". The Govt is keen to get taxes rolling in. And women's employment is protected (supposedly) and paternal leave is available too (supposedly). I can understand why women return to work. Especially if supported by the secret army of grandparents, beavering away in the background, unappreciated.
Personally, I don't think you should have children if you cannot afford them comfortably dons flak jacket and joins phoenix behind the sofa.