We first used the Owlet Smart Sock with our son and are now using it on our daughter, starting from when she was six weeks old. I cannot express the peace of mind Owlet has given us with both our son and daughter. Being able to check on them via the app from bed was most reassuring and meant I could sleep. We have taken the Smart Sock on holiday to different countries multiple times and it has been great. I have worked in childcare for over 10 years and wholeheartedly recommend the Owlet Smart Sock to all new parents.