Girls, who haven't given their child vitamin D at all? We tried all th…

Girls, who haven't given their child vitamin D at all? We tried all the drugs for two months already, it seems like none of them worked. I don't give it, everything gets better immediately. Will there be nothing if you don't give it? I think maybe it will grow up and then, but I'm afraid, what if Rickets? Or problems with teeth and hair?