Received super fast !! These are high quality layers. I use baby the day mainly in relay with the Baby Dry overnight. No leakage problem for my little girl.
About the size, for a baby of 7 kg, preferred size 4 to size 3 otherwise it's too tight. Size 4 is useful up to 16 kg beyond, it's always just a little (when you get to 2 kg below the maximum weight)