Be a Friendly Role Model
You don't have to leave the house to show your baby how to be outgoing. When your husband walks through the door, say, "Let's greet Daddy. 'Hi, Daddy. How was your day?'" Smile and use a warm voice when answering the phone, and then tell your child who called ("That was Grandma. She's coming over to visit later. Isn't that exciting?"). You can also take out dolls, stuffed animals, or puppets and throw a pretend party. Have the toys greet and chat with one another, and show them taking turns and being polite. Your child won't be ready to mimic these behaviors for quite some time, but it's never too early to introduce them.