If you Google the safety of these, they are not recommended at all as it can compress the chest and overheat the baby, both which increase risk of SIDS. I only know as I was looking into this myself 🙈🙈 obviously completely your choice, just thought I’d mention incase you weren’t aware.
Weighted sleep sacks are a big no no. Health visitor advised me in this during my safe sleeping chats at the beginning. Shouldnt be used in babies under 1 and even then they still feel they shouldn't be used. Obviously entirely up to you x