Put him on his feet too early
The legs and back of a baby are not strong enough to support his weight. Therefore, it is not recommended to make your baby stand up too early, even if you hold him under the arms. It is especially dangerous to put him in a walker. Baby walkers are banned in Canada since 2004 due to the risks of accident. It is best to wait until your baby is 6-8 months old and can stay sitting before letting him stand and even at that age, only do so for a few minutes. His reflexes might make him look like he is ready, but he is not.