Breast Feeding

Breast Feeding subject headings:

Medline:

Ovid:
exp Breast Feeding/ OR exp Lactation/ OR exp Milk, Human/ OR exp Lactation Disorder/

EBSCO:
MH "Breast Feeding+" OR MH "Lactation+" OR MH "Milk, Human+" OR MH "Lactation Disorder+"

CINAHL:
MH "Breast Feeding+" OR MH "Lactation+" OR MH "Milk, Human+"

EMBASE:
exp lactation consultant/ OR exp lactation/ OR exp lactation inhibition/ OR exp lactation disorder/ OR exp breast feeding/ OR exp breast milk

PsycInfo:
DE "Breast Feeding" OR DE "Lactation"

Equipment sterilization

MeSH:

• Disinfection
• Sterilization
• Equipment Contamination

CINAHL Headings:

• "Sterilization and Disinfection"

EMBASE Headings:

• instrument sterilization
• disinfection

Poverty Medicine

Here are some MeSH that I found for Poverty Medicine:

• Poverty
• Poverty Areas
• Homeless Persons
• Medical Indigency

There are similar ones in CINAHL:

• Poverty
• Homelessness
• Homeless Persons
• Health Services for the Indigent
• Indigent Persons

Keywords of potential use:

• impoverish*
• disadvantaged
• vulnerable
• "at risk"
• marginali*
• "street involved"
• street

 The last one is because I came across some other variations such as "street entrenched" and "street youth", but of course you're also more likely to come across irrelevant results.