Difference GBB as I've been there and have talken in RL to people who have been there I know what they thought -
If I have the baby during my study when I am in College 18 hrs a week, and 11 hrs a week of University, I will have more time with the baby then if I am in a full time career.
If I start out on the career ladder with my baby, there won't be any adjustments have to be made, when I have become selfish, and not thinking about anybody else.
The childcare is the most expensive in the early days, as I earn more money, we can live in a nicer house, as the childcare will reduce and my income will increase. This did not actually happen for me as I chose to continue spending the money on 'childcare' and changed it to spending on school fees.
I have all my life to see the world, esp as we are living longer, if I start the career path now, as well as have my children, my children will have flown the nest and I will have a pension that means I can retire or at least reduce my hours at 50.
These are all thoughts that I had when I was 17 - at the same time as other friends were planning to be consultants at the earliest age possible, and have children in the future. No problem with that life choice either.