DD1 did this with walking - took 3 clear steps at 11 and some months then didn't walk again until a couple of months later.
DD2 has done it as well, she rolled over (both FTB and BTF) for me and for OH on separate occasions but this was weeks ago and hasn't done it again since or even looked like she might. She doesn't seem to have any interest in rolling over now even though she put so much effort into trying before those first rolls. Maybe she decided she didn't like rolling and chose to concentrate on other things instead.
I'm not concerned (yet) just find it very strange and wondered if anyone else's LO has done something just the once?
Re: Anyone's LO have a first then not done it again?