Hi there,
as a mom of now three kids and I used to work for Zero to Three,National Center for Infants, toddlers, and families in DC.
So I have some experience, LoL...
Provide opportunities for your toddler to develop relationships with peers. Children need practice in order to learn to share, take turns, resolve conflict, and feel the joy of friendship. Playing together gives children all of this—plus a chance for parents to connect with others adults, too! At this age, being present during play-dates is important as children often need help learning and practicing their new friendship skills. And it's a good rule of thumb to keep playdates short for little ones—45 minutes-to-an-hour is about right for most toddlers. For older toddlers, you can use their playtime with peers to nurture relationship-building skills by:
•Suggesting, when appropriate, that children turn to peers for assistance or to get answers to their questions: “You are wondering how to get the little doll to sit in the high chair? Why don’t you ask Jeremy? I just saw him feeding her a few minutes ago.”
•Asking children to imagine how their behavior might affect others: “I see that you told Greta that she can’t play ball with you. How do you think that made her feel?”
•Encouraging children to work in groups or as teams, when appropriate: “Sam and DeShawn, could you please put the cars away? Then you can help me get your snack ready.”
•Helping children to see others’ points of view, which encourages empathy: “Casey is feeling sad because his mom had to go.”
So at around 18 months to two years it is a greta idea to let them have playdates or playgroup time. Yes they will play side by side a lot, but you'e planting the seed. It will definately help build strong relationships in the future.
http://www.zerotothree.org/child-development/social-emoti...
The library story times are a great idea, also maybe a moms morning out program.
Have fun and good luck,
pammy