Skandapurana 6.3.20.67

6.3.20.67

sarvapāpādhikaṃ pāpaṃ bālahatyā dvijottama .
bālahatyāyuto vipraḥ pacyate narake dhruvam .. 20.67 ..

Greater than all sins is the sin of killing a child, O best of the twice-born. / A brahmin burdened with the killing of a child is surely cooked in hell.”