"BB成日"烘"係女人個心口度唔係幾好" is not a valid or sensible point, you can ignore it.
After the age of 2, there is not need to drink. But of course, some mother will give milk powder. For me I will not because there is no other mammals drinking milk after grown up. Also, there is no other mammal drinking other mammal's milk.
I am a fully-pump mom, now my son is 25 month old. He show no signs of weaning so I am still pumping 2-3 times a day. My opinion is that if he wants to drink milk, I will give the best to him, not other animal's milk.
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