I know my LO is still young, but she's only happy swaddled. I used to only swaddle her at night, but now she wants to be in her sack all the time. I can''t keep her swaddled all the time can I? Won't it impair development (my aunt said that) Whatever keeps her happy right?
I wouldn't keep her swaddled CONSTANTLY. If you do, she's never going to learn to do things like roll over or crawl. At times if it is what calms her down and makes her happy then I would say that's okay, but yes I agree with your Aunt that keeping her swaddled constantly might keep her from doing things that she needs to do.
But I will say that my daughter is 6 months old and I still swaddle her to take naps and to go to sleep at night. Sometimes if she gets fussy I will swaddle her up even if it's not time to go to sleep or take a nap. But I make sure that I give her time to not be swaddled as well!