Biochemically speaking the Nat sulp or Nat phos will decrease acidity (therefor increase chance for male child ?). I do not know of any biochemic remedy that would increase acidity.
Maybe change diet, increased intake of acidic foods: vinegar, lemon juice, etc.

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Christiaan van Schalkwyk<br />Registered Homeopath (RSA) (M.Tech.Hom (Natal))