Two broods are normal during the summer, and while the female incubates her second clutch of eggs, the male will take care of the youngsters from the first hatching, sometimes taking the young birds to one of his other nests.
Käblikul on ühe suve jooksul tavaliselt kaks kurna, ning siis, kui emalind haub teist munakurna, hoolitseb isalind esimese pesakonna poegade eest, viies noored linnud vahel enda ehitatud teise pesasse.