Hi A.,
If the noises aren't a problem at school and his behavior is the same, then maybe he's just letting out some internal energy. I understand that his noises are probably annoying. Using distraction like you are is a great idea and a positive way for him to use his energy. I would also try getting down to his level and very quietly say to him..."I know you want to make your sounds, can you make your sounds very quietly like a butterfly? Or if you want to make loud sounds lets try it for one minute loud and then try soft again." (try using the word sounds -it's doesn't have as much of a negative connataion as Noises). You can also try to distract yourself from the sounds so you aren't so annoyed by them. Are his sounds loud that will distrupt your baby's naps? When he starts making his sounds, is he excited, bored, tired, hungry, needing anything emotionally? Or maybe he's just experiencing with his voice. Unless it's really out of control loud and his behavior is uncontrolable when he makes the noises, you might just have to put in ear plugs and let him go through it:) 3 yrs old can be a challenging time for child and parent! -it's just a part of them growing into thier own. The less we try to control them the better off everyone is. **Guiding, encouraging, loving, disciplining, teaching our children is different than controlling. Just continue to look for signs in his behavior that could indicate that something is different, and in the meantime continue to use your postive distraction, or soft sounds, seeing if he's needing something when he makes his sounds, or ignoring it. You know your son best, and your own level of "I can't handle these sounds anymore!":) I'm sure this will pass soon.
In Peace,
A.
mom of 4, Birth and Parenting Mentor
www.birthingfromwithin.com