If you haven't heard of this, check it out! It it seriously the best 100 dollars you can spend. I had bought this for my firstborn because i couldn't sleep at night worrying about SIDS. I was every every 5 mins checking on him. This gave me the peace of mind to sleep better. I recommend this to everyone! It has saved lives. Out of all the baby things to buy, you won't regret this one. Read the reviews! I now have a 3 month old and he has slept with it every single night since he came home. I haven't changed the batteries on it since I got it over a year ago. Hope to change someone else's life!