English Translation
That child is always fretting.
What is だだ?
My dictionary has these entries:
駄駄っ子 [だだっこ] (n) unmanageable child, spoiled child (spoilt), spoiled brat
駄々っ子 [だだっこ] (n) unmanageable child, spoiled child (spoilt), spoiled brat
駄々を捏ねる [だだをこねる] (exp,v1) to be unreasonable, to whine, to throw a tantrum
ダダ (n) tantrum, fretting
駄駄 [だだ] (n) tantrum, fretting
駄々 [だだ] (n) tantrum, fretting