Blood Drawn on Infant: Advice Needed

Aiden is 16 weeks and just went through this last week in the hospital he was SO sick but was really upset when they took blood. they did the normal stuff had me hold him down and used a butterfly and took one vial..got it in the arm.. then Friday they did it in a lab.. same way used a butterfly. he was surprisingly calm.. just let her do it... it wasn't fun though cause she lost the vein and the blood started...then stopped..so she had to keep prodding for the vein.I KNOW that hurts cause it happens to me all the time..so he did get upset..I didn't do any Tylenol.. its just hard..sigh..best of luck.