It depends on individual but I will send my gal to playground around 22mo. I want her to gain more social skills and also the younger they start the easier to adapt. But at 18mo may be a bit too early in my opinion because their immunity is not strong. I think not much learning in playgroup yet , more of gaining some social skills .
For enrichment classes you can try the highly reviewed Julia Gabriel. But my thinking is these classes do not actually alter our kid's IQ levels later on , it is more of nurturing the curiosity to learn and ask questions
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