My DS didn't like it as he was (is) very nosy and that didn't work for him just starting at the ground lol. He was born holding his head up and is very strong. He never snuggled his head in to sleep either, always had that head up stretching and lurking about making sure not miss anything. I still practiced tummy time with him though as I knew it was developmentally important. I would roll up a soft, snugly blanket into a bolster and propped him at his chest up high so he could still see things at higher levels, much happier! Funny enough he didn't crawl or sleep on his tummy until he was 9 months old and then he started walking at 10 months old.