Hi mommy! Four months is still super early para mag-crawl, so kung pitik lang siya ngayon pero strong na ang grip, that's actually normal, bawat baby develops at their own pace talaga. A few of my mum friends noticed their babies were super strong grippers around that age pero hindi agad crawling, kaya don't worry if she's not doing everything on schedule yet! That said, pag may concerns ka sa development, better to check with her pediatrician lang para ma-ease your mind at makakuha ng proper guidance. She sounds like a strong little one though, mommy!