0 ▁and ▁ 2 0 ▁months ). ▁Another ▁study ▁found ▁that ▁the ▁type ▁of ▁ant ib i otic ▁expos ure ▁was ▁also ▁significant ▁with ▁the ▁highest ▁risk ▁of ▁being ▁over weight ▁in ▁those ▁given ▁mac rol ides ▁compared ▁to ▁pen ic ill in ▁and ▁ce phal os por in . ▁Therefore , ▁there ▁is ▁correlation ▁between ▁ant ib i otic ▁expos ure ▁in ▁early ▁life ▁and ▁ob es ity ▁in ▁humans , ▁but ▁whether ▁or ▁not ▁there ▁is ▁a ▁caus al ▁relationship ▁remains ▁unclear . ▁Although ▁there ▁is ▁a ▁correlation ▁between ▁ant ib i otic ▁use ▁in ▁early ▁life ▁and ▁ob es ity , ▁the ▁effect ▁of ▁ant ib iot ics ▁on ▁ob es ity ▁in ▁humans ▁needs ▁to ▁be ▁we ighed ▁against ▁the ▁benef icial ▁effects ▁of ▁clin ically ▁indicated ▁treatment ▁with ▁ant ib iot ics ▁in ▁inf ancy . ▁ ▁Inter actions ▁ ▁B irth ▁control ▁p ills ▁There ▁are ▁few ▁well - control led ▁studies ▁on ▁whether ▁ant ib i otic ▁use ▁increases ▁the ▁risk ▁of ▁or al ▁contra cept ive ▁failure . ▁The ▁majority ▁of ▁studies ▁indicate ▁ant ib iot ics ▁do ▁not ▁inter f ere ▁with ▁birth ▁control ▁p ills , ▁such ▁as ▁clin ical ▁studies ▁that ▁suggest ▁the ▁failure ▁rate ▁of ▁contra cept ive ▁p ills ▁caused ▁by ▁ant ib iot ics ▁is ▁very ▁low ▁( about ▁ 1 %). ▁Situ ations ▁that ▁may ▁increase ▁the ▁risk ▁of ▁or al ▁contra cept ive ▁failure ▁include ▁non - comp liance ▁( missing ▁taking ▁the ▁pill ), ▁vom iting