Babies who are breastfed cry more than those who are formula-fed, a new study has found, but mother’s milk is still the healthiest option.

The Medical Research Council in Cambridge, U.K., studied 316 three-month-old infants, some breast-fed and others formula-fed. Mothers of the breastfeeding babies reported their children cry more and are more difficult to soothe.

“There is an overwhelming body of evidence supporting breastfeeding as the normal and most healthy form of infant nutrition and our findings do not contradict this. Bottle-fed babies may appear more content, but research suggests that these infants may be over-nourished and gain weight too quickly,” lead researcher Dr. Ken Ong said.

One theory is that babies prefer formula to breast milk in the same way many people prefer burgers to salad, even though the latter is much better for you.

“Our findings are essentially similar to other stages of life; people often find that eating is comforting,” Ong said.

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