I was told to beware of toddler sensitivity but I never guess I have to face it at this early stage. At 20 months Zoe understand our conversation. Of course, we under estimated the little girl ability to understand it. Actually, we suspected that when my brother in-law placed her daughter with my mother in-law, Zoe became jealous as my mother in-law is taking care of the little baby. Regret to say that I don't what is the level that Zoe was left alone but we're trying to make Zoe to understand the whole situation.
Another incident, when Mum friends try to coax Zoe to follow them by saying Gong Gong does not want her anyway, Zoe started to cry instantly and kept holding to Gong Gong and never want to let go. Just now, before she fall asleep, she needs Gong Gong assurance that Daddy, Mummy, Gong Gong and Po Po wants her.
From all the incidents we realised that our little girl is sensitive and even at this early stage she actually understand her surrounding. It's now that we need to spend more time with Zoe talking to her and ensure that she realise that we love her.