How do you know if your child needs speech therapy

This is starting to bother me. My son will be 3 the end of May but doesn't pronounce his words that great. I know what he is saying, but also lacks sentence structure and some people have made... *cough comments on this..

For example when he says words like...

doggie, it's more like 'dohe'
thank you is 'than you'
outside is more like 'side'
Taylor(his sister name) is 'yalor'
nose would be 'ose'


Also I notice when he tries to pronounce a word, it's the last letter that seems hard for him to pronounce.

The most he has put into making a sentence is 3 words. I know boys develope slower than girls but I guess with comments and going by my other two kids at that age...it makes me think.


Like(like lol) when my SIL told me he needed this. My kids have been so far apart that I can't remember the golden rule and there was never an issue brought up with them... They make straight A's in school. Okay a few B's here and there.

So can anyone give me some advice or things to lookout for to see about his developement.

TIA