How to get my mother-in-law to back off a bit, we have a new baby and she is constantly dropping around.?

Well, I didn't have any grandparenting help when my babies were born and I always envy the people who do. Anyway... tell your wife that you desperately seek alone time with just her and the baby when you come home for work (and you better be willing to help and not just crash on the couch because you're tired; parenting is EXHAUSTING). Hopefully you're wife can then ask her mom to help during the day before you come home. It's up to your wife to talk to her mom, not you. Good luck dad, you're not going to get any real rest until you're kid heads off to college though (but it's all good, so don't stress).