Re: Growth spurt question
There's a big growth spurt at around the 3 month mark, so that would be my first guess at an explanation for what you're experiencing. It would explain the increased nursing frequency perfectly. The nighttime and nap time behavior- well, that could be a growth spurt or it could be the beginning of teething or it could be the fact that at 3 months your LO is mastering a lot of new milestones which can interfere with sleep. Seemingly simple things like discovering how to reach or put your fingers in your mouth reliably can really change a baby's sleep patterns, because those things are really big for the developing brain. I don't think adults can begin to comprehend how much a baby is learning, and how stimulating the world is for them.
There's very little you can do about sleep at this point, but I do recommend getting a copy of Elizabeth Pantley's book "The No-Cry Sleep Solution". It's got plenty of gentle techniques that can encourage a baby to sleep longer and more independently, and 3 months is a good time to read it because IIRC Pantley recommends not trying to change anything about your baby's sleep patterns until around 4 months of age.
Coolest thing my big girl said recently: "How can you tell the world is moving when you are standing on it?"
Coolest thing my little girl sang recently: "I love dat one-two pupples!"