Hi thanks for writing to Practo.  According to books The incubation period of rabies in humans is generally 20–60 days. However, fulminant disease can become symptomatic within 5–6 days; more worrisome, in 1%–3% of cases the incubation period is >6 months. Confirmed rabies has occurred as long as 7 years after exposure, but the reasons for this long latency are unknown. So if not as post exposure, u can surely take 3 doses of vaccine as pre exposure vaccination and protect baby .