how to know my new born is getting enough breast milk

A. Hello good morning !! If the baby is gaining enough weight 400-900 gm per month,sleeping 14-18 hours a day,peeing 6-8 times a day then the milk is sufficient for the baby. Milk and dairy products papaya,rusk ,bread toast ,papaya,chiku,garlic in curries,garlic milk,saunf water,poppy seeds having more water help in improving milk production .