My Chinese Speaking lil fellow

Since Maximus is being taken care by his grandma during weekdays (8:30am - 7:00pm) which he spends most time with her, he is learning his Chinese language (Mandarin). His grandma usually speaks Mandarin to him and he will pick up the simple vocab from her.
Now, he uses more Chinese vocab to communicate with us compare to English. But Ive no complain because this can be a basic and good exposure to him at later age when he attends school. We are able to teach him English or BM but not Mandarin since both of us are not Chinese-educated so it's very much depending on his grandma.
His Mandarin vocab are:

1. chi-ge (this)
2. na-ge (that)
3. pah-pah (scared)
4. pao-pao (carry)
   

These 4 lil words care being applied most in his daily conversation with us. For example: When mummy asked him what does he want, he replies chi-ge (pointing to the thing that he wanted). Or when he is scared of something, he will pat his chest and say "pah-pah".
So my lil boy is able to understand the Chinese language. This is a good sign for us to decide - Chinese-medium or Kebangan school (BM-Eng medium).
My personal opinion, I dont like Chinese-medium school because there is too much of drilling in the learning. Anyway, it's a long journey before we actually decide. We are still enjoying listening to our lil boy speaking different languages for different contexts. Cute-little voice yet very chatty especially when he is in the mood!