Everything I have seen for a child that is born in the DR is that the proper permissions from both parents are needed for the child to leave the DR. I am not sure if simple notarized signatures are needed or the more complicated path through the government offices in Santo Domingo are required from those documents. I am guessing it is the more expensive and complicated documents through the Cancilleria in Santo Domingo.
My wife and I took her grandson with a US passport, born in the US of Dominican parents with his father a citizen in the DR and mother a legal resident in the US, through Santo Domingo to the US without a hitch (except for paying his three month overstay fee since he as a US citizen.) There were no permissions needed at all in our case.
We called the Migracion people in Puerto Plata, Santo Domingo and Punta Cana airports before we made our trip and they all told us that we would have no issues since the child was a US Citizen travelling on a US passport. I suggest calling at least Santo Domingo Migracion at the airport to confirm what you need for a child born in the DR.
My wife and I took her grandson with a US passport, born in the US of Dominican parents with his father a citizen in the DR and mother a legal resident in the US, through Santo Domingo to the US without a hitch (except for paying his three month overstay fee since he as a US citizen.) There were no permissions needed at all in our case.
We called the Migracion people in Puerto Plata, Santo Domingo and Punta Cana airports before we made our trip and they all told us that we would have no issues since the child was a US Citizen travelling on a US passport. I suggest calling at least Santo Domingo Migracion at the airport to confirm what you need for a child born in the DR.