3rd Trimester

Halo Sleep Sack - what are the velcro strips/loops for? (pic)

I received this lightly used newborn sized Halo Sleep Sack as a gift. What are the two velcro strips on each side near the bottom for? In the below pic I am holding one. I have asked the person who gave it to me, friends with kids, and also Googled this and I cannot figure it out! 

TIA
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Re: Halo Sleep Sack - what are the velcro strips/loops for? (pic)

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