There is no divorce, so we can only focus on negotiation. If the relationship does break up, you can negotiate or sue for divorce to fight for the custody of the child.
 Generally speaking, children under two years old will be awarded to their mothers. After the age of two, it will be judged according to the specific circumstances of both parents, such as their ability and conditions of support.
 [Legal Basis]
 Article 1084 of the Civil Code states that the relationship between parents and children shall not be eliminated by parents' divorce. After divorce, whether the children are directly raised by the father or the mother, they are still children of both parents.
 After divorce, parents still have the right and obligation to support, educate and protect their children. After divorce, children under the age of two shall be directly supported by their mothers in principle.
 If both parents fail to reach an agreement on the upbringing of a child who has reached the age of two, the people's court shall make a judgment on the basis of the specific circumstances of both parties and the principle that it is most beneficial to the minor children. If a child has reached the age of eight, his or her true wishes shall be respected.