N.O.
Wow! You don't get married an have kids so you can go out every night and socialize - you get married and have kids so you can build a family and thsose relationships should be primary. His friends that "never call" are busy doing what they want/should be doing is my guess - spending time with the family.
You made two big life changes (marriage/baby) in a very short time, so I can see how he (and you) would be thrown a bit, but it is what it is and it COULD BE great if you guys develop a new life togther instead of trying to force your old life to maintain - your social life is important but right now it shouldn't be looked at as a loss b/c things have changed....this is great too and he's going to miss it if he spends all his time mourning the "good old days."
My husband and I were/are very social but definitely slowed down the going out and having people over when our kids came along. We look forward to staying in with our kids and having time ALONE when we can get a sitter and go out - you obviously love your husband and are sweet for being concerned about his feelings, but I would strongly suggest he gets with the program and finds the joy in this new stage in your life - you will get in a groove again and have PLENTY of time in life for other stuff - you're literally going to blink and your baby will be 1, 2 and one day gone. I have the major advantage of having a lot of friends with kids who are older than mine and boy would they trade places with me being "stuck home" with the kids any day - good luck!!!