What is your LO wearing to sleep?

Jade
My son is 7 months and now that the weather is getting cooler, I worry that I'm not dressing him warm enough at night cus his little feet are cold in the morning. He usually just wears a footie pajama/onesie to sleep in his crib. What do you start to use for an extra layer? Is anyone using blankets yet (I haven't because of SIDS risk)?