Ds is 4 months ((19 weeks). A few weeks ago he rolled forbthe first time. He did it a few times that day and the next so didn't appear to be a fluke. Since then though he's only done it a handful of times. Is this normal? He last did it about a week ago. He has plenty of opportunity (ie lying on either his back or front). He moves a lot (particularly on his front he'll do a complete 360!) but no rolling anymore.
Is this normal to do it and then just stop?