Mhmm??!

My son is 3 months, going on 4 months may 5th. He got broncholitis id say 3 weeks ago at least (he doesn't get smoked around so it kind of confuses me that he got that) but he's no longer sick again. But, before he got sick he always oohed and ahhed 24/7, always talking no matter what he was doing. But while he was sick and after, he just stopped. I don't know if he's hitting another milestone & just stopped focusing on oohing and ahhing so he can focus on newer things bc he just discovered his feet and always holding them throughout the day but now he's oohing and ahhing a lot once again, sometimes he'll say agoo & he's always girdling too, like he once was again.