I bought this a couple of weeks ago coz she was very snotty but hesitated to use it as I didn't like the idea of squirting her nose.. But she was struggling to feed earlier and always snorts when she cries.. Her nose was soo blocked I was worried about her sleeping tonight so I used it.. She did scream for a min after but straight away two big clumps came out both nostrils and she was IMMEDIATELY able to breathe normally!! It's so amazing I had to share!! It's suitable from birth..