The relationship could face some strain. The stress of raising a half - vampire baby could put pressure on their relationship. There could be moments of jealousy if the baby shows more of a connection to one parent than the other. However, through communication and their deep love for each other and the baby, they would work through these issues and their relationship would ultimately become more resilient.
Their relationship would become more complex. They would now have a shared responsibility for the baby. There might be some disagreements on how to raise the child, especially considering the baby's unique nature. For example, Edward might be more cautious due to his long - lived vampire experience, while Bella might want the baby to have a more 'human' upbringing.