Q. Is it true that rest will increase FL and HL of a fetus?

Answered by
Dr. Megha Tuli Gupta
and medically reviewed by iCliniq medical review team.
This is a premium question & answer published on Jun 14, 2016 and last reviewed on: Oct 09, 2018

Hi doctor,

How to increase the FL and HL in a fetus, when lagging behind about two to three weeks in the third trimester? Is it a major problem? Please suggest the treatment?



Welcome to

I understand your concern.

  • It is normal for certain parameters to lag behind the gestational age of three to four weeks in the third trimester.
  • There is no way to increase these parameter bits and there is no need to worry. These are just measurements and are subject to errors.
  • The total gestational age as such is important and a slight variation in individual parameters does not need any treatment or medical intervention.

For further information consult a fetal medicine specialist online -->

Thank you doctor,

I came to know that FL and HL growth may be enhanced by taking more rest. Is it right? Please specify the rest in hours for a pregnant woman in their 37th week.



Welcome back to

  • It is a false notion that rest increases these parameters.
  • It is like saying that if the mother rests then the baby will fatten up. That is not true. It does not work out like that.
  • I would suggest that do not worry so much for this. I am very sure that your baby is absolutely fine and will be absolutely healthy and beautiful.
  • The discrepancy you mentioned is a mechanical error. Two to three weeks difference is expected in some parameters and it is fine.

For further information consult a fetal medicine specialist online -->

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