My youngest is nearly 4 months. I breastfed my last baby for 18 months and never needed to supplement but this time my son often screams at the breast and seems urgently to want more milk - more quickly. For this reason I introduced one bottle of formula mid-afternoon as that is the time when he gets most cross at the breast.
Today was the third day of giving formula at 4pm. He drank it quickly and furiously and was happier in the early evening than he has been in weeks. By the bedtime feed I was engorged so thought he would be happy with my breastmilk, he drank 15 minutes at each breast and then started to cry and urgently root for more. The crying got so bad that I offered a formula top up and he guzzled the whole bottle. This was 3 hours after the previous bottle and straight after a long feed from two engorged breasts. He seems ravenous.
Does it sound like I do not have enough breastmilk for him? Why might this be and what can I do about it? I do not want to give up breastfeeding but he seems much more satisfied by the bottle and tonight's events make me doubt my milk.