Correct

成个儿

/ chéng gèr /
Strokes

Example

As a Verb

grow to a good size

1
hóutáo
猕猴桃
zhī
liǎng
yuè
jiù
néng
zhǎngchéng
长成
gèr  
个儿
  

The kiwi fruit can grow to a good size in two months.

As a Verb

be well formed; be in the right shape/proper form

2
Xiǎoháizi
小孩子
de
bān
一般
dōu
xiě
de
chéng
gèr  
个儿
  

Little children's handwriting is usually not in the right shape/proper form.