This is a guideline for baby developmental milestones during the first year.
It’s so exciting the first time they smile at you and then at each other. So when do babies generally start to smile and grasp, crawl and start teething? This is a guideline only of when a baby may accomplish each milestone by month. Not necessarily in this order exactly or exact age especially if they have an adjusted age
It is important to understand that twins may not reach their twin baby milestones exactly as per the above development milestones, and that is also fine as there are a number of factors at play, but generally full term twins meet the milestones as above.
If you are at all concerned about the development of your children, please contact your doctor directly.