Today my 2.5 yr old DD swam 10m today! 
I am such a proud Mummy; was in total shock! We've been doing regular lessons since she was 3m old, but even so, I realise to most it'll sound like I'm massively exaggerating, and so I don't feel like I can tell many people for fear of them thinking I'm 'one of those' Mums!
Anyone else's LO master a skill which you were really proud of, but felt you couldn't shout from the rooftops for fear of being considered an exaggerator?