Is this something to worry about?
So we were in the car. SO is driving our boys are in the back, our 4 year old for some reason kept taking his arms out of the seatbelt (when noticed I corrected it and told him it needs to be on properly) then he ended up taking his seat belt off my SO then turns and sees the seatbelt is off and gets annoyed immediately pressed the breaks of the car to basically show him the need for the seatbelt. The car jolted hard he even looked surprised Obviously after that our boy didn’t take it off for the rest of the journey but I just feel like that was a bit much our 1 year old was also in the car am I overthinking ??
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If your 4 yo can't or won't sit properly in a booster with a seatbelt, he needs to be in a harnessed seat still. Best practice is not to switch to a booster until a minimum of 5 years old, consistently 40 pounds (or more depending on the limits of the exact booster seat), and mature enough to always sit properly with a seatbelt. As for what your SO did, it was dangerous. Your 4 year old could have been hurt. I completely understand his thought process, but it's not worth the risk even if you're positive that scaring him would keep him from doing it in the future (which it probably won't - he's 4)
Nothing bad happened, so I would let it go. Especially since it seems to have taught him to keep his belt on 🤷 It's okay to disagree with the solution, but it's not worth an argument. Think of a solution you prefer and share that with your SO