Baby weight chart by ageBaby ageFemale 50th percentile weightMale 50th percentile weight3 months12 lb 14 oz (5.8 kg)14 lb 1 oz (6.4 kg)4 months14 lb 3 oz (6.4 kg)15 lb 7 oz (7.0 kg)5 months15 lb 3 oz (6.9 kg)16 lb 9 oz (7.5 kg)6 months16 lb 1 oz (7.3 kg)17 lb 8 oz (7.9 kg)