This is a perfect gift for new parents .... i'm a new mommy and i came up with this cozy device for our daughter ... she's been using the concept since she was old enough to hold a bottle ... now making sizes to fit sippy cups :)
https://www.etsy.com/listing/210522709/handmade-crocheted-bottle-cozy-with?ref=shop_home_active_6pair this with a store bought bottle or cup ... give those new parents sanity :)