Some info taken from another site...

How many babies does mommy Robin have?After copulation, female Robins lay one egg about every 24 hours until her clutch size is around 3-4. The incubation period lasts from 12-14 days and hatching of each egg takes about 24 hours; the order the eggs were laid is the order of hatching (Howell, 1942; Slagsvold, 1996). While the eggs are in the nest, females cover them about 50 minutes of every hour and overnight. Females rarely leave the nest during incubation and rely on the mate to bring her enough food to survive. Once the Robin chicks hatch, they remain in the nest for 13-15 days, until they are mature enough to survive on their own (Wauer, 1999). Fledglings can fly within 2 days of leaving the nest, so the male parent watches them until they are able to live completely on their own (Weatherhead and McRae, 1990).