I switched my baby's formula from soy milk to elecare. she has not had a bowel movement in a day. is this normal? she also has been spitting up more

Constipation: Soy formulas are usually more constipating that others, but the opposite can be true as well! The only way to figure out which formula is best for a baby's digestive tendencies is by experience. It can take up to two weeks after a formula change for the results to be known, so rapid formula changes is best avoided. A common trial sequence is: cows milk based, lactose-free, soy, elemental.