This is a very interesting study and in one of our studies, we found that antibiotic-resistant bacteria is found in newborns. The mode of transfer could be through fetus.
I have linked both the articles.
A new study shows that infants that are breastfed for at least six months have less antibiotic-resistant bacteria in their gut compared with babies breastfed for a shorter time. On the other hand, antibiotic use by mothers increases the number of antibiotic-resistant bacteria in infants. -University of Helsinki
https://www.sciencedaily.com/releases/2018/10/181017111006.htm
https://www.ncbi.nlm.nih.gov/pubmed/29501688
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