Does anyone know why baby’s stop babbling some things from time to time??

My son first started with sounds then started to babble ma and ba sounds then he stopped for like a month and then he started back up again and started to ga sounds and then played around with those and even started say da... and now within the last week he has stopped and gone to making weird sounds but no true babbling or that he loses some of what he already knows like right now he’s not saying ma sounds anymore but makes like s sounds..I keep hearing something about when they are learning something physical they sometimes stop babbling but he is already crawling and standing on his own and cruising and can take a few steps or does this also happen during mental learning as well not just physical? Sorry if it’s a stupid question my son is almost ten months old so I’m just wanting to know if this is something I should talk to his pediatrician about... I always feel stupid asking questions