My baby was born 10 days overdue healthy at 5.3kg, 59cm. No gestational diabetes, no complications in pregnancy. She has continued to thrive, sleeps well, breastfeeds well, developing normally. She is 4 months old but fits into 1 year old clothes. She is now 8.9kg and about 71cm. I am worried that she may have some kind of gigantism or overactive growth hormone. Could this be?