My little boy didn’t start walking until 17 months, I really wouldn’t worry, each baby is different and none of them are textbook x
Crawling backwards only, bum shuffling and not pulling themselves up. However he is huge on the 98th percentile! Health visitor said all normal and they don’t make any referrals unless baby isn’t walking by 16 months x
I wouldn’t worry too much, my boy is 1 (just turned) and isn’t walking yet and I worry about it when I compare him to babies much younger walking! If you are really worried though I’d maybe consult with your doctor or health visitor? My boy has been crawling since around 7 months and pulling himself up since around the same time but all babies do things at their own pace. My friend across the road has a little girl and she’s 14 months and not crawling yet too so I really wouldn’t worry xx