Young house sparrows remain in the nest for 11 to 23 days, normally 14 to 16 days. During this time, they are fed by both parents. As newly hatched house sparrows do not have sufficient insulation they are brooded for a few days, or longer in cold conditions.he house sparrow is typically about 16 cm (6.3 in) long, ranging from 14 to 18 cm (5.5 to 7.1 in). It is a compact bird with a full chest and a large rounded head.