The query asks whether the size or shape of a pacifier can influence its effectiveness for colic. However, the provided search results do not contain information about pacifiers and colic. Therefore, I will provide a definition of colic.
Colic is pain caused by the contraction of the muscular walls of a hollow organ, such as the renal pelvis, biliary tract, or gastrointestinal tract, when its aperture is blocked. In infants, especially those who are bottle-fed, intestinal colic is common, indicated by restlessness, continuous crying, and drawing up the legs. Colic can occur with enteritis, intestinal tumors, or certain types of influenza. Lead poisoning may also cause colic due to spastic contractions of the bowel. Treatment focuses on symptom relief and may include muscle relaxants like atropine or, in some cases, meperidine hydrochloride.
I am unable to provide information about the effectiveness of pacifier size and shape for colic, as the search results do not contain this information. Would you like to explore other treatments for colic?