Long term effects of Reglan on my child

My son was diagnosed with stomach reflux when he was 2 days old. He took Reglan until I changed pediatricians when he was 2 years old. My son was always very clumsey. (He is 12 now). We began noticing as he got older that his left leg seemed weaker than the right. He does not hold his left arch up and walks over on his ankle. The muscles in his left leg are noticeable smaller. He is also much less coordinated with his left hand. The doctor has told us the weakness is due to mild brain damage caused most likely before he was born. Is it possible that two years of taking Reglan could have caused the damage? Do the face twitching problems reported after taking Reglan, happen soon after taking the medication, or could this show up later in life?