I was given this sleep sack when my baby was born, she still wears it at night and she still has room to grow. It's been fantastic, regulating her temperature and I know she is perfectly warm. When transferring baby to the car seat the merino sleep sack has a convenient design which allows baby not to be disturbed and makes going out a breeze. The dome on the shoulder unclips for feeding time and this sleep sack washes well and drys fast. I am very impressed and rate this an essential item for any new mother.