I sent my kid to kindergarten at the age of 4. But I wished I had did it earlier at 3. Even at 4, due to MCO, we spent a bulk of the time doing silly online class. The earlier your kid is being brought into a social setup, the faster they learn and grasp skills. We started with a big class kindergarten but was eventually being kicked out from there with the reason they couldn't handle our kid. Even one of his classmate was ejected. And this happened after 1.5 years at that silly kindergarten. Why only after 1.5 years only (they need money especially during MCO). We ended up at a much smaller kindergarten at 6-7 kids per class (it's rare in Malaysia). His ex-classmate was reunited back at this new place. Fast forward 6 months and had our first PTM. Everything is excellent and our kid is much much happier and never once doesn't want to go to school.Teachers are very patient and our kid picked so many things from academic wise and most important other important life skills. Of course we paid similar price to international school kindergarten at around 22K a year for half day (but the teacher to student ratio in international school is usually even much worst) but we are glad fate brought us to the current school. So, don't be afraid to send your kids earlier. The more sensory they are exposed to, the better they will develop. Just make sure they are potty trained. Our kid was potty trained very early and although he was wearing a diaper until 22 months but at around 1 year old he was wearing it just in case if accidentally pee or poo. Most kindergarten is very particular about this diaper part and potty train.