She is the peak risk of SIDS?

👩🏻

I read online it’s 2-4 months. Does that mean the fourth month is included (so up until the 5th month) or once the child hits 4 months it starts to decrease?

I can’t get my baby to sleep alone and he is 3 months. I’ve tried everything and have spent 100s on all the different beds and products. I am terrified of SIDS though.