when i did the check up at 20 weeks, my doctor said my 羊水 was much less than normal and recommended me to do a 3D ultrasound to identify the cause of being 羊水少. the result was everything normal. the doctor then asked me not to worry because sometimes there could be no cause for that . he also said the most effective way of getting more 羊水 is to take more rest. but because of that, my son did not have enough room to turn upside down and i had to take c-section to get him out. now my son is 14-month old and is very healthy.
the most important thing is to identify the causes as the doctor said it could be because of malfunction of kidneys or other structural things. if the doctor confirms everything OK, then just relax and take more rest.