My 13 month old who bum shuffled like mad to get around has in the space of half a day completely stopped doing it. He started this afternoon just pointing to things and refusing to go and get them. It’s completely out of character. He’s also off his food and has been crying today. I thought he was teething but why would that stop him moving?
I would keep a careful eye on him. Can and will he bare weight on his legs still if you try to stand him up and hold him? Not weight baring can be a sign of serious illness ( assuming we he was doing this previously) if in any doubt contact your doctor/ out of hours etc.
I would usually agree with the previous poster in the sense that you don't need to panic if your little one is otherwise well and that babies do go through phases, especially when working on something else like pointing etc.