Because every child develops differently, this can be a difficult question to answer. Your child's pediatrician should be your first source of information. He or she should be able to, with your input, notice any signs of problems in your child's development. Be sure to inform your doctor of the types of problems that have been associated with galactosemia. Also, sometimes parents know best, so if you suspect a problem, and your doctor does not agree with you, get a second opinion.
Research shows that the earlier a problem is treated, the better it is for the child.
Remember to keep in mind that children develop at different rates - learning disability is defined as a significant gap between a person's intelligence and the skills the person has achieved at each age. Some medical insurance companies may pay for all or part of these services. Check with your own policy. This site contains an interactive guide to learning disabilities for parents, teachers, and children.