Isn’t a squint just a cosmetic problem?
Strabismus is not merely a cosmetic problem, it definitely does not recover by itself with age and no age is too early to start treatment for a squint. At the same time it can be treated even in an older child although best results are achieved if it is addressed as early as possible.
Certainly the appearance can lead to problems for the child, but a squint is not merely a cosmetic problem. If left untreated, it can lead to a permanent visual defect in the squinting eye. Treating squint would be cosmetically desirable and glasses or surgery can give good results in many cases.