Your cousin s child is not your second cousin as is commonly believed. You can also think of it relative to that shared set of ancestors that you share with your first cousin which would be your grandparents.
If your second cousin has a child you and that child are second cousins once removed to each.
If your cousin has a baby what is the baby to you. If you are female you are great aunt. If your first cousin has a child you and that child are first cousins once removed to each other. Well technically you can.
If you are male you are great uncle to your niece s child. Children of your cousin are actually called your first cousins once removed so if you re wondering what relationship your cousin s child is to you that s it your first cousin once removed. The appropriate name for addressing your cousin s child is niece or nephew even though they are actually first cousins once removed.
If a cousin has a baby the baby is a cousin one further time removed to all other cousins of the parent. Removed refers to a difference in generation from you and your first cousin. Seriously nobody in the united states does that unless they are a genealogist which would of course make them correct.
The child is your great nephew if it is a boy or great niece if it is a girl. His parent your cousin is your first cousin because you are born in the same generation and have the same grandparents. If your first cousin has a child that child is your first cousin once removed.
But nobody writes a birthday card or a name tag to my dear first cousin once removed. If the parent has a second cousin the baby is a second cousin once removed to that. He is born in the generation after yours thus creating one degree of separation.
But as you are the baby s mothers cousin which is sort of like a sibling type relationship the baby may also be referred to as your niece nephew and you its aunt. The little guy born to your cousin is your cousin once removed because you are separated by one generation. It will be a cousin but what.
So calling your cousin s son your nephew or your cousin s daughter your niece is really a matter of family.