When to transplant your plants?
It’s time to transplant the plants when they have passed the seedling stage and are beginning to enter the vegetative phase of the grow cycle.
Usually when the plants need watering much more frequently than it usually does. It will also probably start to display symptoms,such as completely stunted growth. The leaves may begin to turn yellow and wilt. This means it’s time to transplant; otherwise you could stunt the growth of your plant forever.You can transplant them.
When you transplant the plants,you should do it carefully to avoiding any unnecessary damage.You can fill the next pot half way up with soil or other stuff which you are using.
And water the plants and leave it to dry out for few hours,it will help the root system from transplant