I am after some advice on using a weighted blanket or weighted long toy dog over the legs/ body of a child who is under 12 months but over 7 months. They like to sleep on an adult so the weight of the blanket/toy helps them feel like the adult is still there. I understand that comforters are 'ok' for children over 7 months, but specifically a weighted one might be a worry due to restricting the movement of the child? I am eager to hear back. Thanks.

Weighted blankets & sleeping bags are not recommended.

Weighted sleeping sacks, like weighted blankets, are incredibly unsafe for babies. These products can compress a baby’s chest, leading to a possible lack of oxygen. Weighted sleeping sacks can also cause overheating - a well-known risk factor for SIDS.

There is much research into the vulnerability of babies and children in the sleep environment, particularly with regard to their airways. We know that babies, in particular, have smaller and more easily compressed airways, a more easily compressed chest wall, and less respiratory stamina than older children and adults.

Babies have died due to pressure directly on or against their chests. This is because the pressure inhibits full expansion of the chest and the abdominal movement required for healthy breathing.

There is very little research on the safety aspects of weighted blankets or sleeping bags for babies, particularly in the context of sleep safety in babies and children.
https://rednose.org.au/article/weighted-blankets

Soft toys & comforters should only be used with the same recommendations. eg any comforter (toy or blanket) that is large &/or heavy should be avoided as they may compress baby’s chest & make it difficult & compromise breathing.  Weighted blankets & sleeping bags are not recommended.