no please...there is nothing scientific about it. there are so many people out there who will tell you that applying kajal can increase the size of the eyes. no, it cannot. all it does is harm the eyes of babies, and cause infection, especially if the baby rubs the eyes. please avoid it at all cost.
There is no scientific evidence on benefits of applying kajal. Instead most of the times it is unhygienic and may cause infection in eyes.