DS was 3960g when born, at 5 days he was 3700g. He was weighed yesterday (day 14) and is 3820g, so he's only regained about half what he lost. Midwife didn't say anything either way about this being good or bad so I assume it's okay, but it was only when I got home and was flicking through some of the leaflets that I noticed newborns are supposed to have regained birthweight by around day 14. Should I be worrying?