Bronchitis - baby

Bronchitis can be caused by either a virus or bacteria, so whether it spreads really depends on what's behind it. Viral bronchitis tends to be more contagious since the underlying virus can pass to others, while bacterial bronchitis is generally less so. Since it's your baby we're talking about, it's worth checking with your PD to find out the exact cause, and they can also advise on precautions around older kids or family members at home. Better to get clarity from the doctor than to guess, just to keep everyone safe.