Hello, we're on the breastfeeding journey, how do I feed my baby with …

Hello, we're on the breastfeeding journey, how do I feed my baby with breast milk, I take a bottle right away, it starts crying, wheezing and spitting up, spits out milk, sometimes just water, volumes always different, doctors say normal, but this happens constantly, spit up and starts biting nails, licking - showing that he wants to eat. It's necessary to carry him in his arms all the time so that at least some of what was eaten is saved because you put him down and immediately milk back, it can be like a whole day off, then normal for a full day, then again spitting up in a row... I don't understand what's going on. Ultrasound of the head is normal,