Each family needs to do what's right for them. I will say- I would highly recommend getting your kid into a daycare or preschool program once they hit the age of 2- if not sooner. I went to part time for a bit when my kids were born so I wouldn't have to send an infant to daycare. But they started 'school' around the age of 10-11mo. It was a good age as they were mobile, could feed themselves, etc. Even if I didn't work full time, I would still send my kids to school on their usual 2 day/week schedule. The art projects, reading, writing, stories, activities- not to mention overall social interation with other children and adults is- in my opionion- a huge gain to their development.
I'm spoiled and have grandmas to watch my kids 2 days a week. Husband 1 day (he works 4 10s), and then school the other 2. I'm one of those moms that couldn't be home all day, everyday with a 1 & 3 yr old. Just wouldn't work for me. But we've still had to sacrifice as childcare in my area is outrageous. I pay $1000/mo for 2 days/week for 2 children. It's easy to see why a lot of women dont' go back to work- if that were 5 days a week, you'd have to ask yourself if what you end up bringing home is really worth it?