I read a brilliant article...wish i could show you it but it was years ago...where a lady lived with a small group of native people living somewhere 'away from civilisation' where people have very defined roles depending on their skills. and one skill was child rearing..and those people looked after the tribe's kids while parents worked. a lot!
Now, why i tell you this is because they did all sorts of tests around the question of do children bond with parents or carers, is it good for kids etc.
And they found that children had good relationships with carers...BUT when parents entered the creche area children's behaviour changed from being centred round carer to them smiling and beaming and radiating joy at their parents. they did tests and question type stuff for years...and found that even though children went to this creche as babies and spent more hours there than at home , the children's strong relationship and loyalty was with mum and dad, at least the people who they went home with.
That gave me so much comfort and it really was true. even when i did loads of hours and picked her up at 6 she was MY baby :-) Aldo she loved nursery, even from a baby and has very strong ties with staff and other families.
part time is good, though you may find yourself unable to give 100% to baby or job....but compromise is totally fine.
P.S. someone told me that the parent guilt starts at conception and never leaves what ever you do......