I find the merino kids sleeping bags really good. Cos they're made from merino wool they don't have tog ratings, they're fine for anything between 18 and 30 degrees. On warmer days/night I just put DS in a tshirt, but if it is a cool night (we live in Melb) then I will put him a body suit. I love that they breathe really well and it stops me worrying about him overheating. They are a bit more expensive than the grow bags, but they are for newborn to 2 years and because you can use them all year round you definately get your moneys worth.