the earliest is 2 years reason being suffocation.. babies that young can’t wear masks for risk of that. you might want to try those face shields instead
2 month old definitely too young, try face shield or stroller raincover. My lo started wearing mask on n off around 14mo
U can tired to purchase the baby hat that come with face shield to wear.
2 mths old sounds abit too early! Later they suffocate…
Min to wear is at least 2 years.