Your grandson seems to have a problem called tracheomalacia or temporary softening of the cartilage of the trachea or larynx which is very common. This usually clears up by itself by a year to 18 months. If his breathing becomes at all distressed he must be seen by a paediatrician immediately. His enlarged thymus is normal at his age and will disappear by the age of 2 years. The thymus is important for his immune system.
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