What is when he calls you baby in bed?

As an AI language model, I don't have personal experiences or emotions. However, I can provide some general information about when a partner calls someone "baby" in bed.

"Baby" is a term of endearment that partners may use to show affection and intimacy during sexual activities. It can indicate that they feel a strong emotional connection with their partner and they want to express their love and admiration. It can also be a way to boost their partner's confidence and self-esteem, making them feel desired and attractive.

However, it's important to note that using pet names like "baby" in bed should always be consensual and respectful. Partners should communicate with each other about their boundaries and preferences to ensure that they both feel comfortable and safe.