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Per experience ko po, mas maganda pag c OB ung mag aadvice kc iba iba po ung ultrasound at may certain period/months lang din na pwede. Example ung transV kelangan if may need agapan macheck, pag 2nd trimester naman pwedeng abdominal nlang. Starting 20wks - 30wks naman pwede ung CAS. Tapos last trimester pwedeng 1-2x irequest ni OB sau. Sa case ko breech pa si baby nung CAS (28weeks) kaya pinag ultrasound uli ako nung 30weeks (abdominal) at dun nakita na umayos naman na ung position.