When did you let your child have a blanket?

I’m struggling to find a sleep sack that fits all of my daughter’s needs regarding her eczema that is affordable. (See last post for more info) I feel like our only option is a blanket, but realistically she’s not going to keep that on her. And I’m not comfortable having one in her crib with her. She’s almost 2 but we’re not moving her to a toddler bed for a while as there’s no reason to. But I am so apprehensive about anything else being in her crib with her. And my in laws definitely will not allow her to have a blanket in the pack and play she sleeps in at their house. Which I understand, they don’t want anything to happen to her in their care.

When did you give your child a blanket instead of sleep sack at night?