Nouveau-né

un nouveau-né or un nourrisson = a newborn

Coming from, respectively:

• nouveau (feminine nouvelle) = new
• né / née = born
• nourrir = to feed

As someone who can never remember when consonants are doubled, I sometimes need help with nourrir (two 'r's) and mourir (to die - only one 'r'). A well-known trick is to use a single 'r' for the verb related to something you do only once, and two 'r's for the one you do more than one time. Works for me everytime.