Unusual Nature. The kiddywidget doesn't require air, food, drink, or sleep.
Multiattack. The kiddywidget makes two attacks: one with its bite and one with its tail.
Bite. Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit:4 (1d4 + 2) piercing damage. If the target is a creature, it is grappled by the kiddywidget (escape DC 8).
Tail. Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit:4 (1d4 + 2) piercing damage plus 2 (1d4) lightning damage.
A skitterwidget that gives birth to a kiddywidget can't procreate for 3d6 days afterward. Still, given that skitterwidgets are constructs with no natural life span, there is no telling how many kiddywidgets a pair of skitterwidgets can produce.