Vacuum sounds a lot like being in the womb so maybe that's why he didn't react to the vacuum.
Thank you!
Newborns do not react to loud sounds early on. My lo didn’t blink an eye at my dog barking at first but now it will wake him if he is just starting to fall ast
He’s getting used to things he could be in a learning process and his focus is on something else and that certain noise can startle him