A reference dealing with your specific question, complete with a protocol for studying specifics in your mother/baby duos:


An observational study of associations among maternal fluids during parturition, neonatal output, and breastfed newborn weight loss 
Noel-Weiss J, Woodend AK, Peterson WE, Gibb W, Groll DL 
International Breastfeeding Journal 2011, 6:9 (15 August 2011)


Conclusions
Timing and amounts of maternal IV fluids appear correlated to neonatal output and newborn weight loss. Neonates appear to experience diuresis and correct their fluid status in the first 24 hours. We recommend a measurement at 24 hours, instead of birth weight, for baseline when assessing weight change. Because practices can differ between maternity settings, we further suggest that clinicians should collect and analyze data from dyads in their care to determine an optimal baseline measurement. 

 
Study protocol      
Iatrogenic newborn weight loss: knowledge translation using a study protocol for your maternity setting 
Noel-Weiss J, Woodend AK, Groll DL 
International Breastfeeding Journal 2011, 6:10 (15 August 2011)

Abstract
Background
In our original study of newborn weight loss, we determined there were positive correlations among newborn weight loss, neonatal output, and the IV fluids mothers received before their babies' birth. Basically, an increase in maternal IV fluids is correlated to an increase in neonatal output and newborn weight loss. When assessing newborn weight change, our recommendation is to change baseline from birth weight to a weight measured at 24 hours. The purpose of this paper is to provide a protocol for clinicians to collect and analyze data from their own maternity site to determine if the newborns experience such an iatrogenic weight loss and to make decisions about how to assess newborn weight changes. 
Methods
We recommend a prospective observational study with data collected about maternal fluids, neonatal output, and newborn weight measurements. The methods we suggest include specifics about recruitment, data collection, and data analysis. 
Discussion
Quality assurance and research ethics considerations are described. We also share practical information that we learned from our original study. Ultimately, to encourage knowledge translation and research uptake, we provide a protocol and sound advice to do a research study in your maternity setting. 



K. Jean Cotterman RNC-E,  IBCLC
WIC Volunteer LC       Dayton OH

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