Child development

hi, Im here to ask not to brag... please -- my son was a late bloomer. he didnt crawl and started walking at around 1year and 1 month. speaking was late also and was not attentive when we call him by his name.. our pedia is very attentive and monitored our child very well.. then when he turned 2.. he suddenly speak in sentence, (english) he can understand (chinese commands) our pedia was relived since he can now speak and understand commands.. after that he started , singing.. memorizing .. now he can determine the color , 2d & 3d shapes, months of the year, days of the week, planets numbers 1-20 30 40 50 60 70 80 90 100.. fruits , vegetables, names, at first we thought he just memorized it. we start challenging him.. and he did very well even math (addition) he can answer them.. we just got back in Philippines and cant see our pedia at the moment.. was it normal?? coz we are freaking out here..