o this rule in my mind is the new Similac® that really does seem to leave the stools about the same consistency as breast milk.) So true constipation in bottle fed infants is much more common; my feeling is that soy formulas are even worse than cow milk based formulas in this regard.<br /><br />The young infant's colon is simply not designed for all the residue and stool bulk. The residue builds up, is dried too much, and becomes hard, pebbly stool. It is naturally difficult and uncomfortable fo