Berat baby

Hai. Nak tanya macam mana nak tambah berat baby? Baby saya 8m nearly to 9m in few days tapi berat 7kg. During check up dc said okay je but bila tgok growth chart he should be 8kg and above. Susu badan kerap. Makan pn okay. Tinggi okay. Lilit kepala okay. Just berat je. Kalau jumpa orang mesti cakap kecilnya baby and i feel sad about it. Thanks mommies.