L.K.
Hi L.,
First off, do not feel guilty!! You are going back to work to make sure your son has everything he needs in financial support. You are doing it for him. I had to put both of my kids in daycare when I had to go back to work after 12 weeks maternity leave. I would have loved to stay home with them, but financially, it was impossible. AND... I really think they learned way more at daycare than I ever could have done for them. Between learning their letters,reading, socializing, sharing, etc. they had a much busier day in daycare then I ever could have provided them!
Kids adjust so quickly and I really think it's harder on the moms and dads than it is on the kids. You may find that your son will cry when you drop him off, but I bet anything that he is fine within minutes of you leaving... It will be worse for you then him... If he has a lovey or favorite toy, make sure you bring it with him. You can also make a little photo album with pics of you and other loved ones for him to take with him... then he can look at you whenever he wants.
Good luck going back to work!