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Gross foetal ascites
can occur in a pathology called Non-immune hydrops among other causes. There ca be infections like Herpes
infection which can cause fluid accumulation. Also kidney problems in the fortus, liver problems can cause a similar picture. Which trimester are you in at present. According to the cause the treatment can be done. You need to contact a Foetal Medicine Specialist for better information of your child. Tender coconut ca be taken moderately though it will not help in this condition but will have good nutrition.