 [ Symptoms ] can a day care toddler touch the baby [ Disease ] sure why not the baby has to eventually get those germs in order to jump start his own immune system so why not from a loving sibling germs are often the only thing that siblings openly share i am not suggesting that you take the newborn to visit ill people or kids but viral exposure is really inevitable    expect it if parents put kids in day care at an early age they will most likely be over exposed to lots of viruses from lots of different cohorts in those babies expect colds to come early and often