Just to offer an opinion.
Even when they start going to daycare at a younger age (4 mos) they can still get separation anxiety. My son is now 11 months and he sometimes gets upset when I drop him off. I'm sure he's fine after I'm gone but he's upset at first and he's been going to daycare since he was 4 months. I don't think the fear of separation anxiety should prevent you from going back to work if it's what you want to do.