Unless you're wearing this all the time and nothing but it, your child will not associate this scent with you. Babies that small associate your BO with you. On the other hand, you can use this to your advantage. Believe it or not, an artificial scent is actually good in the hypothetical situation you described. Because once you start independent sleeping, it'll be easier since you can just add the on a blanket thus the child will eventually correlate the scent to sleeping. Just make sure you don't wear it any other time outside of sleep training because then they'll just see it as another scent in the world. Hope that makes sense lol! And to answer your first question, it's a bit heavy upon first application but it fades 10-15 minutes later into a much subtle scent.