African American infants have a 24% greater risk of having a SIDS-related death, compared to the U.S. population as a whole, and experience a 2.5 greater incidence of SIDS than in Caucasian infants. Rates are calculated per 100,000 live births to enable more accurate comparison across groups of different total population size. Research suggests that factors which contribute more directly to SIDS risk—maternal age, exposure to smoking, safe sleep practices, etc.—vary by racial and ethnic group and therefore risk exposure also varies by these groups. Risk factors associated with prone sleeping patterns of African American families include mothers age, household poverty index, rural/urban status of residence, and infants age. More than 50% of African American infants were placed in non-recommended sleeping positions, according to a 2012  study completed in South Carolina, indicating that cultural factors can be protective as well as problematic.The rate of SIDS per 1000 births varies among ethnic groups in the United States:
Central Americans and South Americans: 0.20
Asian/Pacific Islanders: 0.28
Mexicans: 0.24
Puerto Ricans: 0.53
Whites: 0.51
African Americans: 1.08
Native American: 1.24

Society and culture
The rate of SIDS varies vastly among different cultures and countries around the world, with SIDS rates lowest among Asian and Pacific Islander infants. Some evidence supports the hypothesis that SIDS is not an ancient phenomenon and that it appears more commonly in western societies. Much of the popular media portrayals of infants shows them in non-recommended sleeping positions. See also
Fading puppy syndrome
Failure to thrive
Neonatal isoerythrolysis
Newborn care and safety
Sudden unexpected death syndrome
Sudden unexplained death in childhood

References
Further reading
Ottaviani, G. (2014).
The woman may have a fever that usually subsides in 24 hours. The nipples may become stretched tight and flat which makes it difficult for the baby to attach and remove the milk. The milk does not flow well.A fever may occur in 15 percent, but is typically less than 39 degrees C and lasts for less than one day. Causes
Failure to remove breast milk, especially in the first few days after delivery when the milk comes in and fills the breast, and at the same time blood flow to the breasts increases, causing congestion. The common reasons why milk is not removed adequately are delayed initiation of breastfeeding, infrequent feeds, poor attachment, ineffective suckling, a sudden change in breastfeeding routine, suddenly stopping breastfeeding, or if a baby suddenly starts breastfeeding less than usual. Treatment
The mother must remove the breast milk. If the baby can attach well and suckle, then she should breastfeed as frequently as the baby is willing. If the baby is not able to attach and suckle effectively, she should express her milk by hand or with a pump a few times until the breasts are softer, so that the baby can attach better, and then get them to breastfeed frequently. She can apply warm compresses to the breast or take a warm shower before expressing, which helps the milk to flow. She can use cold compresses after feeding or expressing, which helps to reduce the oedema.