I have twin boys aged 15 months. They normally fights for a toy/ or anything new. Earlier it was a slap on the others head with the toy or hand but now they have started biting each other. Is there any way we can discourage this and encourage sharing?
Hitting and biting are natural things for toddlers to do. Part of your job is to teach them how to do something different. It's hard, and I'm sure it's harder still when there are two of them in that stage together. Some of what you can do:
Finally, if you can arrange their lives to minimize conflict at this young age, do try that. Having only one of something means they will tussle over it. Being put within reach of each other while tired, hungry, or confined means they may take out their frustrations on each other. Don't set them up to fail; set them up to succeed. They'll get lots of chances to share and to sit together nicely, so try to make the majority of their day smooth: enough toys to go around, each sitting in their own space instead of right next to each other, each sleeping in their own crib, etc. Space and money might not let you create entire parallel existences, but twins are often asked to meet a much higher bar of sharing and co-operation than singletons: make sure you're not setting it too high.