Let's say a child's passport was issued when he/she is 6 months old and now this child is 4 years old. Passport is still valid for at least a year. Is the child's passport still acceptable? Though clearly in the passport photo the child has little resemblance, but on the child's visa is his/her most recent photo? Will this be granted access or be accepted by an immigrations officer? Clearly it isn't the child's fault since it is understandable that the child will go through aging process. But such circumstances are, do you think the child's passport is still good for use even if he/she has a most recent photo on his/her visa?
The child's mother/father will be accompanying the child. I have searched some threads/article and found out that some countries accept passport of minors even if they look different on the photo for as long as the passport is valid.