Infants who lack certain types of gut bacteria in the first few months of life may be at increased risk for asthma when they’re older, a new study from Canada suggests.

In the study, researchers examined the gut bacteria of more than 300 infants when they were 3 months old. Those who had low levels of four specific types of gut bacteria were much more likely to be diagnosed with asthma at age 3 than were infants who had normal levels of these gut bacteria.

The four bacteria are FaecalibacteriumLachnospiraVeillonella and Rothia, which the researchers combined into the acronym FLVR.