My son, 15 months old, had his first dentist exam today and the dentist took about 5 minutes to examine my sons teeth and determined that he had a crossbite and stated that if his bottom lateral incisors hadn’t come in yet that they were probably missing and we would have to correct later down the road (around age 13). Is this uncommon for those teeth not to have come in yet at 15 months old? Should I get a second opinion or should we just wait it out to see? I’m not sure if it’s necessary to note but he currently has his top and bottom central incisors, his top lateral incisors, and all 4 of his first molars popped through this past month. The dentist did not do X-rays because of his age to confirm any missing adult teeth, is this common practice? What questions should I be asking his dentist?