I was/am in a simmilar position.

I returned to work part time (being that I worked a full day Monday 6:00am to 5:00pm and then I worked from 6:00am to 9:00 sometimes 10:00am Tuesday to Friday) when my DS was eight weeks old. When he was 12 weeks old I returned to work full time (6:00am to 5:00pm Monday to Friday and some weekend work).

I did this as I am the main bread winner and we could not live on my DH's wage so he stays home and I earn the bacon so to speak. It is a sacrafice that I chose to make.

I will be honest with you it is hard very hard.

I go home for lunch four days a week and have a rule that unless it is urgent and the office is on fire I leave at 5:00pm on the dot.

My DH & DS sometimes "popp" in at work for a surprise visit - it helps that everyone at work loves DS and love his little visits.

I also have a shrine so to speak on my desk at work of photo's of DS and DH.

I find that if I am really busy I don't notice how much I miss them but it gets to about 3:30-4:00 and I can not wait to see them.

In the begining I really started to resent my DH for getting to stay home and sometimes (even now) I feel as though I get no me time, I am either at work or I am at home with my DS and I feel guilty if Im doing something other than those two things.

Good luck with it all. It is not easy but is doable.