終於識叫媽咪

For months, Nathan would only sound out objects that are phonetically "B-ish": 波波, 鼻鼻, 拜拜, 包包 (麵包), 爸爸, bear bear. The rest were all 嗰個. (Another favorite everyday word was 跌咗.)
After calling me 爸爸 forever, Nathan finally started calling me 媽咪 a couple weeks ago. Not that he couldn't pronounce the "M" sound before - whenever he was frustrated, he would go mamamama (媽媽聲) - maybe I should be glad he never called me 媽媽 and went straight to 媽咪 and didn't associate me with the sound of frustration ?