1st time father here, trying to help my wife out. Our son was born 9 days ago and it seems that his breastfeeding is going backwards. Immediately after delivery, he latched well and sucked very hard. Wife fed him regularly for about 24 hours but became very raw. In house lactation consultant (IBCLC) said he was latching and sucking well but had been on the tip and told her to take 24 hours off to heal then showed us how to use curved-tip syringe. During that time she pumped every 2-3 hours and we would use what she produced and supplement with formula. We were also fighting jaundice at the time so the Dr said that it was important to keep input and output high so that's why we added formula. When she tried to resume breast feeding, he would still latch but did not suck nearly as hard and would either get fussy after a few minutes or would suck lazily for as long as she would allow him to stay on her (up to 45 minutes) without self-seperating. Even after staying at her breast for this time, he would come off and still act hungry, eating up to 50mL of milk that we had previously stored. At this time, my wife could pump about 30-45mL per side so the milk was available.
We are still taking him to the breast 1st, but have been using the feeding tube method and a finger tip to feed him when he shows little to no interest in the breast. He will still latch and appear to suckle but still comes off hungry and eats a decent amount after. When finger feeding he will suck very hard, especially when attempting to remove the finger from hims mouth prematurely. This sounds a lot like what I've read in other posts about nipple confusion but the fact that he will latch but not really feed has us at a loss. Any thoughts/advice on how to get him to suckle like he should.
tl;dr - new born will latch but won't suckle well; possible bad habits from finger feeding. Demonstrates strong suction when finger feeding but doesn't translate to breast.
Thanks for any help!