My son is almost 3 weeks old and I breastfeed. He didn’t latch well so I always use a nipple shield. I’ve pumped and given it to him through bottle a few times and he did well. He is such a titty baby and cluster feeds. I think I want to start introducing formula maybe at night if it helps him get more full and sleep better. I think he has his days and nights mixed up and constantly wants to be held. Any helpful tips or advice is appreciated