I now see 2 teeth protruding on my 5-m.o. baby's upper gum. Is it too early or just on time?

A majority of babies sprout their first tooth when they are between 4 and 7 months old. An early developer may get glimpses of his or her first tooth as early as 3 months, while a late bloomer may have to wait until he's a year old. There are even rare cases when a baby's first tooth is already visible at birth! So at 5 months, your baby's on the right track :)