I do not have specific resources in mind, but a third area to consider is
the risks of premature weaning, as I have seen this practice many times lead
to a child "self-weaning" before even 12-18 months.  I see this happen as
well with bottles of expressed milk, so it's not a formula risk per se.

-Rosemary McNaughton, LLLL
Northampton, MA

On Wed, Mar 25, 2009 at 10:00 AM, heather <[log in to unmask]> wrote:

> I'll leave it to others to discuss the risks, but a study I often share
> with people is this one - it shows the bottle at night does not increase the
> sleep of the parents...and excl breastfeeding is more effective at
> preserving parental sleep.
>
> Breast-feeding Increases Sleep Duration of New Parents
>
> Journal of Perinatal & Neonatal Nursing. 21(3):200-206, July/September
> 2007.
> Doan, Therese RN, IBCLC; Gardiner, Annelise; Gay, Caryl L.; Lee, Kathryn A.
> PhD, RN, FAAN
>
>  Abstract:
> Objectives: This study describes sleep patterns for mothers and fathers
> after the birth of their first child and compares exclusive breast-feeding
> families with parents who used supplementation during the evening or night
> at 3 months postpartum.
>
> Methods: As part of a randomized clinical trial, the study utilized infant
> feeding and sleep data at 3 months postpartum from 133 new mothers and
> fathers. Infant feeding type (breast milk or formula) was determined from
> parent diaries. Sleep was measured objectively using wrist actigraphy and
> subjectively using diaries. Lee's General Sleep Disturbance Scale was used
> to estimate perceived sleep disturbance.
>
> Results: Parents of infants who were breastfed in the evening and/or at
> night slept an average of 40-45 minutes more than parents of infants given
> formula. Parents of infants given formula at night also self-reported more
> sleep disturbance than parents of infants who were exclusively breast-fed at
> night.
>
> Conclusions: Parents who supplement their infant feeding with formula under
> the impression that they will get more sleep should be encouraged to
> continue breast-feeding because sleep loss of more than 30 minutes each
> night can begin to affect daytime functioning, particularly in those parents
> who return to work.
>
> Heather Welford Neil
> NCT bfc, tutor, UK
>
>
>            ***********************************************
>
> Archives: http://community.lsoft.com/archives/LACTNET.html
> To reach list owners: [log in to unmask]
> Mail all list management commands to: [log in to unmask]
> COMMANDS:
> 1. To temporarily stop your subscription write in the body of an email: set
> lactnet nomail
> 2. To start it again: set lactnet mail
> 3. To unsubscribe: unsubscribe lactnet
> 4. To get a comprehensive list of rules and directions: get lactnet welcome
>

             ***********************************************

Archives: http://community.lsoft.com/archives/LACTNET.html
To reach list owners: [log in to unmask]
Mail all list management commands to: [log in to unmask]
COMMANDS:
1. To temporarily stop your subscription write in the body of an email: set lactnet nomail
2. To start it again: set lactnet mail
3. To unsubscribe: unsubscribe lactnet
4. To get a comprehensive list of rules and directions: get lactnet welcome