Teething concern

Laetia

Please if someone can help us. 15 month old baby, advanced on all his milestones. The frustration currently is that he has been teething since 4 month old and still only has one tooth. We can see 4 top teeth. They are quite big, but not cutting through his gums.

Anyone else experienced this before?

He is always friendly but this is painful at times and he is falling behind now on some development areas.