Is it ok for me to train my 4-m.o. on how to stand-up or is it too early for that?

Agree with Jamie. My son also loves to "stand" but that would mean one of us would have to constantly support him lol. He hates sitting and would start leaning back on anything and anyone if we try to make him sit and when it comes to crawling... he would just lay his head down and sigh if we try to tempt him to move with his favourite toy.