baby getting enough breast milk,?

To know if your baby has had enough, he/she should ideally have 7-8 wet/dirty diapers in 24h if he/she is below 3mo. Your breast(s) should also feel significantly softer after a feed. Try feeling your breasts before and after a feed. Some mummies do a weighted feed, meaning that weigh their baby before and after a feed to know how much they have drank. But that would mean that you need to purchase a scale but that is totally unnecessary IMO.