What could be the reason for the delayed eruption of the upper incisor tooth in my one-year-old son?

Hi,

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You should be concerned about upper incisors not erupting even though upper canines have erupted. Lower incisors first erupt around six months of age, followed by upper incisors and canines. As you mentioned that he got lower incisors also at ninth months of age, his overall development looks a bit slow or late development as it is called. The initial step would be to look into your child's mouth to check and feel if upper teeth are around and might be erupting soon. If they cannot be felt, we would have to opt for an X-ray evaluation to see if the milk tooth is developing within the bone and and the status of the bone. Sometimes, there are some hindrances to the tooth, making it difficult for them to erupt. It could be due to a gum issue or may be due to bone tissue. If this is the case, accordingly, we will have to act. But this is the later part. We need confirmation by clinical examination and X-ray to come to any conclusion. I suggest you visit a pediatric dentist or pedodontist for a dental check-up and other clinical look-throughs of your baby. They would check and inform if an X-ray is required or not and what the future steps would be. Thank you.