A PubMed query came up with the following references.

osteoporosis-

1.  Osteoporos Int 1993 Mar;3(2):76-83
Influence of breastfeeding and other reproductive factors on bone mass
later in life.
Melton LJ 3d, Bryant SC, Wahner HW, O'Fallon WM, Malkasian GD, Judd HL,
Riggs BL
Department of Health Sciences Research, Mayo Clinic and Foundation,
Rochester, MN 55905.

"total duration of breastfeeding and duration of breastfeeding per
child were not associated with reduced bone mineral, but breastfeeding
for more than 8 months was associated with greater bone mineral at some
sites."..."While animal studies suggest that pregnancy and
lactation may be associated with calcium loss from the skeleton, these
data indicate that such factors have little long-term impact on bone
mass in humans and little potential for identifying women at high risk
of osteoporosis later in life."

PMID: 8453194, UI: 93200669

2.  Am J Epidemiol 1982 Jul;116(1):141-148
An epidemiologic study of hip fracture in postmenopausal women.
Kreiger N, Kelsey JL, Holford TR, O'Connor T

"The cases had breastfed their children for shorter durations, and
they more often had had both ovaries removed."

PMID: 7102649, UI: 82253807

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formula mixing

Minerva Pediatr 1989 Jan;41(1):11-14
Acute enteritis and dietetic errors in the first 6 months of life
[Article in Italian]
Cataldo F, Violante M, Bellia L, Traverso MG, Ruggeri G, Romano G

The infants under 6 months old and suffering from enteritis had "a high
incidence of feeding errors (almost always feeding with artificial
formulas, wrong concentration of milk powder, failure to sterilise the
bottle and the water used to dilute the milk, too early administration
of undiluted, unboiled bottled cow's milk, too early and incorrect
weaning)."  The mistakes may have occurred because they were poor,
uneducated and their "sociocultural conditions".  Being poor and having
poor nutrition may have made the babies more susceptible to enteritis.

PMID: 2733637, UI: 89281289




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