baby helmet recommendations (for riding in buggy)

I'm looking to get my daughter a helmet for her to wear while ridding in the little buggy we have that is pulled by my bike. She's 7 months old and sits up unassisted fine. The buggy has harness like straps to buckle her in I just need to find a helmet small enough to fit her head. I've seen a few on Amazon but thought I'd try here to see if anyone could recommend one. TIA