Definitely try to get your child in to see a pediatric ophthalmologist soon! The condition of an eye crossing (being out of alignment) is called Strabismus. The eyes don't work together, which can prevent normal vision from developing. If not treated, this may lead to Amblyopia, which is poor vision that occurs when the brain ignores one (or both) eyes. Amblyopia is often referred to as "lazy eye". Both of these conditions are serious and should be treated sooner rather than later in order for your child's vision to develop properly.
A year ago, my daughter was diagnosed with Strabismus (her left eye was turning in - called Esotropia. When an eye turns out it is called Exotropia). Her Strabismus had also caused her to develop Amblyopia - her vision in her left eye was getting worse because her brain wasn't using that eye as much). We started patching her good eye for 2 hours every day for about 10 months. Thankfully, the patching helped the Amblyopia and today she has 20/20 vision in both eyes. However, the patching was not enough to strengthen the muscles in her left eye to "pull it back in to alignment". Therefore, in July she had surgery to correct the Strabismus. With surgery, the muscles of the eyes are readjusted to properly align both eyes. Proper alignment will help your child be able to do things that would otherwise cause issues later down the road (ie: catch a ball, drive a car, etc.). The surgery was probably more stressful for me as her Mom as it was for my daughter. It involves 2 weeks of restrictions (ie: no swimming or water in eyes, no dirty activities, lots of drops, etc.). But 1 1 /2 months later, she is going great! Not everyone has to have surgery, and patching works for many, but if that is the road you eventually have to travel down, everything will be great. There is an amazing doctor/surgeon who practices out of Naperville/Lisle if you need a recommendation (Dr. Patricia Davis - a pediatric ophthalmologist).
Best of luck to you and your child as you work to get this corrected.