Not saying very many words

I know all babies are different and do things in there own time. But I follow a lot of mum groups of Facebook and I’m constantly seeing people saying there 10 month, 11 month, 12 month olds are saying a lot of words, like mama, dads, cat, dog, all different words!

My son was 1 on the 16th March and all he says is mama, dada, hiya and bye bye.

I know it’s nothing to worry about at the moment but it’s just gets me down that these babies seem advanced and my son just hasn’t said half the things these babies are saying!