Girls, at what time do your babies get up on the support?

Girls, at what time do your babies get up on the support? Mine is almost 6 months old and she already stands on the support very hard ? She's actually an accelerated developing child for me. At one month she held her head well, at two months she could turn over on her belly, at four she started standing on all fours, from five months she began crawling, and now she's already on the support? Is this normal? Every time I notice new skills, I am scared, isn't it too early for her age? We have seen an orthopedist, neurologist, they said there is muscle tone present. We have already done two courses of massage, and we will