I've been giving my son melatonin for a few months and it's really helped with his sleeping. He's just a couple months shy of being 2. I researched it and talked to a few doctors and no one advised me against it they more or less said it was my choice.

My son takes 1mg of chewable zarbees melatonin every night but he’s 4 1/2 he started having a hard time sleeping at 4. 2 is way too young. It’s not recommended till age 3. It even says that on the zarbees box. I wouldn’t mess around with sleeping aids even if they’re natural because it does slow down their breathing that’s why they advise age 3. Your best bet would be to go to his pedi and ask them personally.