How can I teach my child to make others happy?

Even as early as 10 months old, your baby can be taught how satisfying it is to help others. If you give her a bite of banana, let her do the same by feeding you a piece. Show her how happy her gesture makes you feel. If you brush her hair, give her a chance to brush yours. These small moments can encourage her to share and to care for others.
As your baby grows into a toddler, simple chores, such as putting her toys back in the toy box or dirty clothes in the laundry basket, can help her feel that she's making a valid contribution.
How your child treats and behaves with others will also come from how she sees you doing this. Babies are usually impressionable and also great mimics. So, if your baby sees you shouting or being rude to your maid then she may pick that up too. Your baby will be happy when she treats people with respect and kindness and sees how glad her behavior makes them.