J.V.
Hello A.. I have a daughter with Down Syndrome and each child will develop differently. Olivia walked at 15 months but we worked very hard with a therapist to get her to that point. She is not as strong as other children her age and does not 'catch' herself well when she does fall but is nowing attempting to 'run' at 26 months. My best recommendation is to get in physical and OT therapy, your child will develop but it takes time, patience and work. If you do not insurance to help with that, check out ECI as that is a free service once you qualify.
I have not had the hair loss situation and that is the first I have heard of loss -- thinner hair is common.
Please email me if you want to discuss anything else related to Down Syndrome. I am not an expert but am a mom. Good luck and I agree with you, Olivia is the joy of my life. I would obviously rather that she did not have Down Syndrome but to not have her in my life is unthinkable.