When do kids start making friends?

Sam
Hey,
FTM here. I have a 14 month old, and we frequent the park and Gymboree. I see her waving hi to a lot of kids, but never any waving back. I know they are kids, and it's totally unrealistic to expect anything in terms of social interactions at this age, but I just want to know when they get there. 
Thanks
San

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