The following are methods to assist a cat in giving birth if it is experiencing dystocia:

Massage the abdomen. For mother cats who are overweight or lack exercise, causing uterine atony and resulting in weak contractions and dystocia, gently press the abdominal wall with your palm in sync with the frequency of the cat's abdominal contractions, gradually increasing the pressure. This can encourage stronger contractions and facilitate the delivery of the kittens.
Drug-assisted delivery. If abdominal massage for more than 30 minutes fails to induce weak contractions and dystocia in the mother cat, subcutaneous injection of 5-10 IU of posterior pituitary hormone and 0.5-1 mg of diethylstilbestrol can be administered to promote uterine smooth muscle contraction, cervical dilation, and facilitate successful delivery of the fetus.
Pulling the fetus. If the fetus has been present for more than 5 minutes but has not yet been delivered, the mother cat should be laid on her side, with her left hand supporting the cat's shoulder and her right hand holding the presenting part of the fetus and gently guiding it into the pelvic cavity. Then, gently rotate the fetus and pull it out.
In addition, there are methods such as stillbirth assistance, dystocia relief, and cesarean section. If you experience any discomfort, please consult an authoritative institution.