My son has always been physically small, on the 9th centile. He was late to walk and loose teeth if that’s relevant, but he’s 15 (16 in 3 months) and he’s still very small and under developed. He’s otherwise healthy apart from some mild asthma, I took him to the doctor recently to rule out any underlying issues but she was really dismissive and more or less said what do you want me to do! Just looking for some reassurance that others have been through similar and have had late developers . Or do I get a second opinion?