Longitudinal Study of Nutrient and Food Intakes of Infants Aged 2 to 24 Months

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Abstract

Objective To determine the nutrient and food intakes of healthy, white infants from families of middle and upper socio-economic status and to compare intakes to current recommendations.

Design Using an incomplete random block design, we interviewed 98 mother-infant pairs longitudinally when infants were 2, 3, 4, 6, 8, 10, 12, 16, 20, and 24 months old. Data obtained included 24-hour dietary recalls, usual food intake, and food likes and dislikes.

Setting Interviews were conducted in the mother's home by registered dietitians. Subjects resided in two urban areas of Tennessee.

Subjects Of the original 98 subjects, 94 completed the 2-year study.

Results Mean energy and nutrient intakes generally met or exceeded the Recommended Dietary Allowance (RDA). Exceptions were zinc and vitamin D, which were each below 100% of the RDA at 9 of the 10 data points, and vitamin E, which was below the RDA in the infants’ second year. Fat intake decreased from more than 40% of energy in the first 6 months to 30% to 32% from 10 to 24 months. One third of the infants drank reduced-fat milks at 12 months and more than half drank them at 24 months. Although infants ate a variety of foods, vegetables often were the least favorite foods. A variety of dairy products provided calcium for the infant but lacked vitamin D.

Conclusions Several nutritional issues about infant feeding before 2 years of age arose. Low intakes of zinc, vitamin D, and vitamin E were observed. In the second year, low fat intake, use of reduced-fat milks, and dislike of vegetables were areas of concern. J Am Diet Assoc. 1997;97:496–504.

Section snippets

Recruitment of Subjects

A sample of 98 infant-mother pairs was recruited from two metropolitan areas in Tennessee. The socioeconomic, educational, and ethnic distributions of the cities are similar.

Recruitment methods included using birth announcements from newspapers; posters placed on bulletin boards in clinics, churches, and similar places where mothers might see them; and personal referrals. More than 90% of the subjects were recruited from birth announcements and referrals.

Birth announcements appearing in

Subjects’ Characteristics

Of the 98 mother-infant pairs initially enrolled in the study, 94 (96%) completed the 22-month study with at least six interviews. Of the four original subject pairs who were not retained for 22 months, two chose not to continue the study after meeting their initial obligation (ie, interviews during 2 to 12 months) and two moved out of state. Two mother-infant pairs were selected as replacements; they had three and four interviews, respectively. Data reported include all subjects who were

Discussion

As expected, there was strong consistency between favorite foods and food consumption data; many of the infants’ favorite foods were also those reported on the day of the 24-hour recall (Table 4) and cited as foods eaten regularly (Table 5). Many of the least favorite foods (green beans, broccoli, carrots, peas) were also reported to be eaten daily or nearly every day by children, at least until 16 months of age. Thus, it appears that mothers were not letting the child's preferences dictate

Applications

Dietetics practitioners need to encourage mothers to include additional food sources of zinc, vitamin D, and fat (such as meat and whole milk) in the infant's diet. In addition, mothers need to be advised that a low-fat diet is not desirable for infants younger than 2 years, because babies require dietary fat as a concentrated energy source for growth and for normal development of the brain and nervous system. ■

This study was supported by Gerber Products Company, Fremont, Mich.

Appreciation is

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