View source for Template:Click this red link for further information about disease occuring before fetal stage

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! Abnormality name !! Affected region!! phase of occurrence !! Definition
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| Esophageal atresia || Foregut ( Esophagus || occurs in 8th week || 1 in 3000-4500 birth- results from deviation of trachoesophageal septum and there is incomplete separation of the eosphagus from laryngotracheal tube. 
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| Eosphageal stenosis || Foregut ( Esophagus || during week 8 || Due to incomplete recanalisation of Esophagus
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| Congenital hypertrophic pyloric stenosis ||Foregut ( stomach)  || onset at 3rd week  and can present neonatally || 1 in 150 male and 1-750 female- muscular thickening of the pylorus 
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| Reverse rotation|| Midgut ||  || Midgut loop rotates in clockwise direction. Doudenum lies anterior to the superior messentric artery ( normally it should lie posteriorly) and transverse colon lies posterior instead of anterior to it ( artery).  
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| Anal agenesis || Hidngut || week 7 || Anal canal end blindly or ectopic anus, or anoperineal fistula. Anal canal may open into vagina in female or urethra in male. 
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