The main reasons for reoperation after congenital ptosis surgery are postoperative ptosis inversion, undercorrection or overcorrection of ptosis, poor lid margin curvature, unsightly heavy lid appearance, incomplete eyelid closure, and upper lid retardation. The majority of ptosis is due to improper positioning and depth of the frontalis flap fixed to the lid, while a few episodes are due to malformations in the development of the lid. If the swelling of the eyelid subsides and the impingement disappears, no special treatment is needed. If the eyelid swelling is still severe, the forehead muscle flap will need to be reoperated to adjust the position and depth of attachment to the lid, or a partial lid resection, gray line incision, etc. 2. Inadequate or overcorrection of ptosis: Inadequate correction of ptosis is usually due to the frontal muscle flap being too long, the position of the frontal muscle flap fixed to the lid plate being too low, incomplete separation of the frontal muscle flap or rupture of the flap resulting in weak muscle fibers, the frontal muscle flap not being firmly fixed to the lid plate or the impact of the external force causing the flap to loosen. The incision should be carefully redesigned and the frontalis flap should be re-separated and fixed firmly in the right place on the lid. In most cases, the frontalis flap is too short and the flap is fixed too high to the upper lid, the frontalis flap is not sufficiently separated to adhere to the adjacent tissues, and the frontalis muscle is hypertrophic and too strong. The frontalis flap should be separated as much as possible without damaging the muscle fibers, and the separation should be sufficient to ensure that the flap passes completely through the supraorbital tunnel. The frontalis muscle flap will be re-sutured after separation to obtain a suitable size and thickness. 3. Asymmetry, discontinuity, and poor lid margin curvature (angular deformity, etc.) are also common complications after congenital ptosis surgery. Most of these complications are related to the design of the surgical incision, the upper lid skin not being fixed to the lid plate or intermittently fixed during the suturing of the lid, and the poor fixation or displacement of the muscle flap to the lid plate. This shows that every detail of the surgery, even the seemingly unimportant step, is directly related to the outcome of the surgery. The frontalis muscle suspension and the function of the orbicularis oris muscle are related to incomplete eyelid closure, so try to keep the frontalis flap fixed as high as possible to keep it close to the lid and not overhang it, and avoid damaging or removing too much of the orbicularis oris muscle. The majority of lid closures improve or recover on their own, but postoperative corneal protection is very important, as poor corneal protection can easily lead to exposure keratitis and corneal ulcers, which can be very difficult to manage. Therefore, a Bell’s sign examination is routinely performed before surgery, and if the Bell’s sign is negative, surgery cannot be rushed. The upper lid lag is an inevitable complication of frontal flap suspension and there is no good treatment for it. The fragility of pediatric tissues combined with the scarring left after surgery leads to more intraoperative bleeding, and the unclear tissue structure makes separation of the frontalis flap difficult making reoperation of congenital ptosis significantly more difficult than the initial surgery. In addition, the lack of cooperation in the child’s examination makes the preoperative examination and the design of the surgery more difficult. The reasons for reoperation are varied and the treatment does not follow a fixed pattern, so we should improvise according to the specific situation to ensure the surgical outcome. For those surgical complications that cannot be avoided, such as upper lid retardation, a clear explanation should be given to the parents before surgery. The choice of surgical approach and timing is also very important in order to reduce postoperative complications. There are a variety of surgical options for ptosis, and the choice of the procedure is closely linked to the preoperative examination. Because the levator muscle is not yet mature and is too thin in children, the use of the levator muscle is often undercorrected after surgery, and the excessive removal of the levator tendon membrane is bound to affect the development of the levator muscle, so it is important to consider the use of the frontalis flap in children with ptosis. The frontalis flap has been widely used for its ideal, long-lasting, and reliable results, and recent improvements have greatly reduced the number of postoperative complications. The timing of surgery is also important. For mild to moderate ptosis, surgery is generally recommended after the age of 3 years, and for severe ptosis that seriously affects visual function, surgery should be performed earlier, but some scholars at home and abroad advocate surgery within 1 year of age. In summary, the postoperative complications of congenital ptosis are varied, and there is no fixed pattern of surgery, making it difficult to manage, so a detailed preoperative examination is necessary to accurately choose the timing and mode of surgery and to actively manage complications when they are found.