Does your little one sleep with blankets in their cot?

Now that it’s getting towards winter and we live in an old house I’m wondering if my 6 month old should be okay with blankets now? My sister is still co sleeping and her little man is 2 years old so I have no one else to ask about it.

At the moment she sleeps on a singlet, Pjs and a ergo 3.5 pouch. My partner and I sleep in pjs, sheet, Donna and a blanket over the top. (Which usually gets kicked off)

Is there still a massive risk at 6 months for sleeping with blankets? 😬