Dna silhouette 12 months 2 Electrocardiogram silhouette about 1 year 1 Heart pulse silhouette about 1 year 5 Heartbeat silhouette about 1 year 3 Blood pressure silhouette about 1 year 6 Electrocardiogram silhouette about 1 year 8 Stethoscope silhouette about 1 year 0