Hello everyone. There's a problem after we established breastfeeding, …

Hello everyone. There's a problem after we established breastfeeding, the baby started eating very poorly. During the day, he breastfeeds every 3-4 hours and only for 5-10 minutes at a time. We try to feed him more often, but he spits it out and throws up, looks around. But at night, he eats every 2 hours (the first break is 3, the others are 2). Because of poor daytime feeding, it seems like there isn't enough milk. I try to express myself so that it doesn't disappear completely. But with two breasts, I get 50-70 ml. So here are my two questions: 1) Is the baby really