Hi everyone. I recently had an ultra sound at 12w6d and the baby measured smaller than the week before. Last week he measured at an appropriate 5.58 cm. This week he is at 5.49cm. Am really worried? Any ideas what this could mean? All the doc said was that he was very small for almost 13 weeks. Help.

Ultrasounds aren't always correct,can be off slightly, due to position of baby or fluid around them, shouldn't worry about baby being small at this point,if it's still small at the 20 week and below the percentile then it's cause for concern, baby still has growing to do now but next time you see him/her be bigger :) x

That size is pretty spot on for 12/13 weeks... Thats not small at all.... Your doc should not have said that. If you saw a nuce quick heartbeat too then it really doesnt sound like you have much to worry about. Re: the differing sizes... As charrz said... The measurement cannot be exact down to the mm as the babies are not a simple shape... They measure head to butt (crown to rump) so if he/she was curled up vs back arched / butt out for example you might get a slightly dif reding.

wishing you good health & happiness for the rest of your pregnancy 😊

Oh thanks guys!!!! You have no idea how relieved I am. I will just be patient and trust that my little guy or gal is being to be big and strong. 

Oh and the heartbeat was music to my ears!!!