She's 18months and has been walking for about a month, she can say mama, and hiya but nothing else. She can wave and blow kisses and seems to have a basic understanding of pretty much everything around her (shell give you her foot to put her shoes on, arm to put coat on, waves when leaving the room etc) dd1 was very advanced for everything so I don't put too much trust in developmental charts (as they have never correlated with my childrens actual development) and pretty much leave them to do things at their own pace.
I am starting to doubt myself though. I don't know why, but I am 
I've never taken them to baby groups, weigh ins (other than the first check up at about a week old, and then once more to go at 6week check) but now I'm wondering if I have should be keeping better tabs on things like this, obviously I'm not trained in child development so I could be missing potential red flags OR there is always the possibility that everything is fine and im having a parental wobble over nothing 
Dd2 is just so behind what dd1 was at this age. The difference is undeniable.
I think I'd just appreciate your experiences really!