My 13 month old DS has always been on the 2nd centile, he was born full term (38+5) at 5lb 11. Each time I've had him weighed there's been no concerns and been told he's following the line nicely. Just had him weighed last week and he is now 18lb 4. He has only put on 1lb in 3 months (lost a lb during a 2 week illness). Being honest I never really looked into or fully understood about centiles until I was speaking to a friend with a baby the same age last week. Her DD is 24lb and was so shocked when I told her DS weight and that he is still in 6-9 months clothing, and told me he'll probably always be tiny. I've been thinking about it a lot and looking into the centiles, I know that the 2nd centile is uncommon, I couldn't find many posts about it and the ones I did, the baby had always gone up centiles by this point. I don't know why but it's worrying me a bit now. He is always the smallest out of a group of babies similar ages. Will he ever catch up? Will he always be the tiny one when he goes to school? I'm 5ft3 and DP is around 5ft8 if it makes any difference. Is there anyone else with a little one on the 2nd centile and has been throughout?