I too don't think that 19 lbs at 15 months old is all that small. I dont' think my son his 20 lbs until he was 15 months. I think many of our kids tend to be small. He is now 3.5 years old and still really small about 28 lbs, we are no longer on any height or weight charts. Doctor says not to worry, he is making his own chart, as long as he is growing and gaining weight. I believe they usually say the AVERAGE 1 year old is 20 lbs so she isn't all that far behind!
Magen
My family!