Thank you everyone for all of the input and ideas for sleeping better and warmer!
Yaya, I am the same as you about wanting cover even when warmer, and thank you for the info about the grobag. I am very interested.
Stacy, it's good to hear from someone who has already done the research on prices, thank you! And also good to know about sizes, don't want to buy something David will just grow out of in a few months...
Tink, the halo sleep sack is another good idea as I am still not sure if DS would just get more irritated about not having his legs free...
Charmaine, is snugtime the same as snuglebyes, do you know? I have used the later before but when I went to get one in a larger size the store no longer had them.
Natasha, we are now in summer here so I am currently having a hard time finding warmer sleep gear since DS is growing out of his winter stuff.
I have a lot to look into! Thank you all!