MiTeeth study is focused on assessment of maternal periapical infections (PAI) and their association with infant birth size in rural Malawi. The study is designed to obtain confirmation for the previous results presented in Ulla Harjunmaa’s PhD thesis ‘Nutrition Supplements, Oral Health and Adverse Pregnancy Outcomes in Malawi‘ suggesting that PAI is a common, previously unidentified and relatively easily modifiable risk factor for adverse pregnancy outcomes (iLiNS-DYAD study).