Q我儿子刚五个月,竖抱时,他头老爱低着,不喜欢抬头(我是从百天才开始竖抱的,百天以内都横抱),但躺着和爬着时头抬得都挺好。我们小区里三个月的孩子都竖抱了,而且头抬得很好,四个多月的孩子甚至可以在大人的腿上站立。而我儿子站立也不太行,只能站一下下,请问大夫,他是不是缺钙? Q My son just five months, vertical hold, his head loves low, do not like to look up (I started from a hundred days began to embrace, within a hundred days are horizontal), but lying and crawling head lift Very good. Our three-month-old children hold their arms upright and carry their heads well. Children of more than four months can even stand on the adult’s legs. And my son is not too standing, can only stand for a moment, may I ask the doctor, he is not calcium?