Re: Gaining weight to fast?
Every baby is different. And it is totally normal for a breastfed baby to gain rapidly during infancy, sometimes as much as a pound per week! The rate of weight gain tends to drop as the baby gets more physically active. A new baby does nothing but lie around, nurse, and pack on the fat. An older baby starts allocating more and more calories to action- reaching, rolling, kicking, sitting squirming, crawling, cruising, etc.- and less to building fat reserves. Your LO's weight gain will probably begin to slow somewhere in the 4-8 month window.
Both my girls gained extremely fast during infancy, rapidly shooting up to the 95-99th percentile range on the weight for age charts, despite having been born on the small-average side. They both slimmed way down as they moved into the second half of their first year, dropping back to the 75-85th percentile range.
One thing to look for is your baby's height and head circumference percentiles. If your baby is roughly matching in height, weight, and head circumference, then she's proportional, not fat. And if she's not matchy-matchy- let's say her weight percentile is far in excess of her height/head circumference- then just wait. There's every reason to expect a major slim-down as your LO gets into the second part of her first year.
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!"