How much should I use formula for a 6 weeks old baby who also gets breastfed as well?

Zahra

I have realised that my baby feels hungry with only 3oz(90ml). So when I top up another oz (30ml) that fills him up and he falls to asleep. My only concern is overfeeding. Should I fed him the 4oz(120ml) or stick to 3oz(90ml)?

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