An onomatopoeic adverb describing healthy, rapid growth (especially of children or plants); growing up quickly and well.
赤ちゃんがすくすく育っていて安心している。
I'm relieved that the baby is growing up quickly and healthily.
庭の苗が雨のおかげですくすくと伸びてきた。
Thanks to the rain, the seedlings in the garden have been growing fast.
すくすく育つ環境を整えることが親の役目だ。
It's a parent's role to create an environment where a child can thrive.