But babies of eight or nine months are very “independent- minded” and may resist being fed and prefer to feed themselves, even if they get very little into their mouths. 是什麼意思

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it means babies at that age want to do things themselves and won't listen to their caretakers as easily anymore. So they might refuse to eat when their caretakers feed them, instead they try to put the food in their mouth themselves. And when they try and feed themselves they don't always succeed in eating a lot of food.