@briony1994, I do it now and then ready! He can hold his head well for a few seconds! So I just make sure his heads sideways! I started it from as soon as his umbilical cord dropped off! Xx
You can do it from when they are born :) I started doing it when Maya was 5 weeks old ( once things had settled down) :) But didn't do it regularly until she was 3-4 months old :) She always had good neck/head control though :) she was a strong bubba :) and still is :) xx