Thank you for posting your question. Echo ( echocardiography ) is an imaging technique for the heart and is done when some cardiac issue( structural or functional) is suspected. The reason an echo is ordered in a newborn or in this case a 50 day old baby, is mostly that the doctor might be suspecting some birth defects in the child s heart. These suspiciouns arise if there are abnormal heart sounds that are heard or if there are recurrent respiratory tract infections or certain changes in the child s x ray which suggest that the heart may be involved. Here according to the information you have given, your child was suffering from cold and excessive crying. These two symptoms are usually not enough to indicate that there is a heart problem. Hence I feel there must be something else your doctor might have noticed that gave him/her the idea to check your child s heart. In the meantime what you could do is keep a watch on your child s urine output, feeding patterns, presence or absence of swelling of body, or excessive sweating while feeding. These could help you to monitor your child s heart at your level. Apart from this, excessive crying after a bout of cold is usually due to nasal blockade as kids of his age are usually obligate nose breathers. I this case saline nasal drops in both his nostrils should help relieve the blockade. If there is anything else you need to know about this case kindly write back.