My toddler does this sometimes too, she just get stuck on a word sometimes. I think its just their way of trying to get the words out
My girl went through this phase. She speaks in full sentences now. When we started noticing it happening we would stop her and then say “take a belly breath” and after she did we asked what she wanted to say and it always came out. I freaked out the first time it started thinking she had a stutter. But belly breaths has helped immensely!
I’m not entirely sure, sometimes it sounds like my son is talking faster than he can think through what he actually wants to say. I can almost see the gears turning as he tries to form a sentence 😂 he’ll usually stop for a second and then once he’s thought through he’ll say it just fine
My daughter is a big talker too and I want to say she’s done some of this, I wouldn’t worry unless it’s sticks around for several months, their brains just seem to get hyper fixated or something. My daughter will pick a little phrase and just say it repeatedly.