M.S.
You have NO IDEA how amazed I am that so many of us have bought into this lie of early school and socialization! I have 4 and they didn't go to preschool at all. They are all fine students, in fact my oldest was tested for gifted in K- having NEVER gone to preschool!
Our babies are torn from us soon enough! Enjoy this brief time with him! I would also encourage you to re think what socialization means. TRUST me, the things they learn from peers is not something I'm usually happy about :>) Ask yourself what all so important thing you learned from a group of kids you r own age? Also, if raising kids is about preparing them for adulthood then we are false socializing them. When's the last time you or your husband were alone in a room all day with a group your exact same age?
You will blink and he will be a teenager! Relish this short time with him, you will NEVER get it back! Don't worry at all about school!! There is a reason children are born to mothers and NOT preschools and daycares! In your arms is the BEST most PERFECT place for him right now! Blessings.