Baby Chris is Three Weeks Old
[This is part 4 of a multi-part series chronicling a pregnancy through the lens of “Baby Chris.” Click here for other parts.] Thump-thump, thump-thump, thump-thump. What’s that sound? Three weeks after fertilization, Baby Chris has reached a significant developmental milestone: his or her heart is beating! The embryonic heart is currently tube-shaped, but already performing […]
