My little guy was born at 35w2 weighing 6lbs7oz. I weighed him 2 days ago and he was 14.6 lbs. He's 12 weeks today and weighs 15.6 lbs. I checked the percentile charts and that puts him above 97% for 3 month olds, and he has a week to go before he's 3 months. He was in the 4% at his one month appointment and 58% at his 2 month appointment. With my oldest, his percentiles have stayed fairly consistent from birth. I know that they think his growth is normal as long as his percentiles stay the same. But DS2 has jumped the chart, and already more than doubled his birth weight in 12 weeks. Is this normal for preemies, or something I should keep an eye on?