The spines will harden after a few hours. It is very important not to touch the sow or hoglets after she has given birth. If touched or bothered she might abandon the babies or seriously harm them. It is important to keep the cage cleaned during the next few weeks. This can be done by using a spoon to remove waste matter.
Mammals feed their young with milk from the mother's body.
This is true with hedgehogs. The mother hedgie will nurse her hoglets. It is important that there is lots of food and water for the mother hedgies while she is nursing her hoglets. The hoglets will drink milk from the sow for about 2 to 3 weeks. After this time the sow will wean them and they will start to eat the food provided.