After it is born, it get oxygen from the air and food from its mother's milk. Before it is born it get both form its mother though the placenta and umbilical cord.
A developing baby gets its oxygen from the blood traveling through the umbilical cord.
The placenta.
To supply the baby with food and oxygen from the mother's body.
the umbilical cord
Baby gets food and oxygen through the umbilical cord. This umbilical cord is attached to the placenta. This placenta is attached to the uterus. In the placenta blood of the mother comes close to the blood of the fetus. There is transfer of food and oxygen to the blood of fetus from the blood of mother. Carbon bi oxide and waste products of metabolism are transferred to the blood of mother from the blood of fetus.
The mother's blood brings digested food and oxygen to the placenta. Here her blood vessels split up into capillaries and the food and oxygen diffuse across into the baby's blood capillaries, which join together to make the umbilical vein, which goes through the umbilical cord to the baby. In some ways, the mother provides the baby with what it needs in the same way as she does any part of her own body.
the usual stuff, oxygen, food, water, not being clubbed to death.
Umbilical cord.
Oxygen
While in the womb the baby gets everything it needs from the mother through the umbilical cord.
Placental mammals respirate using the umbilical cord. The cord, which is attached to both baby and mother, delivers food and oxygen to the baby.
The umbilical cord is the connection between a mother mammal and her baby. The cord grows inside the mother. It starts growing when the baby does, and will provide the baby with food and oxygen until the baby is born.