Girls, the baby is turning 4 months old tomorrow, 17.5 weeks, it's wri…

Girls, the baby is turning 4 months old tomorrow, 17.5 weeks, it's written that growth spurts in children are around 19 weeks (that is nearby). He's cheerful and playful, everything's great, but he suddenly goes limp in his crib when I hold him upright, in other positions everything's okay. It's very hot in Rostov, split doesn't really pull, and there's 28 degrees of heat in the apartment, he drinks water poorly, already just shoving and I get upset myself, I don't understand, he started crawling like a caterpillar and turns over himself, I think it's a growth spurt because he's stressed, sometimes