baby's birth weight

I'm currently 39 weeks and 2 days pregnant. Last checked a week ago, baby's weight is 2.5kg. Is it on a smaller range? 🥺 Doctor mentioned that baby's weight is average but should I be concerned? My first baby was 3.6kg born at 40 weeks 5 days. My 2nd baby, 3.3kg born at 39 weeks 5 days.