Hi, they are safe but leaving your baby in the capsule for a long period of time can be harmful to the babys back.

I used a capsule with my DD, she would stay in it while we visited friends & even through church. She's now 3 yrs old & her back is perfectly fine.

I will be using her old capsule for this baby aswell.

I hope that helps. There is alot of different opinions out there on ALL baby products, you're going to get people who love them & people who hate them