The opinions are discordant. Some pediatricians advise and practice during routine visits of forced discoveries of the glans (distal extremity of the penis). Others recommend to follow the

physiological development of the penis without discovering the tip with sharp maneuvers.
In the newborn, and sometimes even up to 6 years, there is a phimosis. Phimosis is when the tissue that covers the end of the penis (the foreskin) can not uncover it. This closure is absolutely physiological, that is normal and desired by nature. Probably because in this way the penis is more protected from infection (we think when our children fill the diaper with poop), or because his scrolling is useful a few years later in the reproductive act.
If you discover forcibly and with non-physiological movements the glans it creates pain and can lead to lacerations, even bleeding, that are resolved by the formation of scars that can shrink the urethral orifice with the formation of fibrosis in affected area. It is at this point, with the passing of years and continuing to do these maneuvers, that often you have to resort to surgery to cure what natural has become pathological. In fact, now the phimosis, no longer physiological, is due to a fibrous ring at the level of the foreskin that prevents it from slipping on the glans and causes a stagnation of urine that easily leads to infections.
The first approach is pharmacological, apply for about two months cortisone creams and if the
problem does not resolve you have to recur to surgery of circumcision, which consists in the excision and remodeling of the foreskin.