Massage for promoting mental and physical health in typically developing infants under the age of six months

Infant massage is increasingly being used in the community with babies and their primary caregivers. Anecdotal reports suggest benefits for sleep, respiration and elimination, the reduction of colic and wind, and improved growth. Infant massage is also thought to reduce infant stress and promote positive parent-infant interaction.

The aim of this review was to assess whether infant massage is effective in promoting infant physical and mental health in low-risk, population samples.

Relevant studies were identified by searching the following electronic databases up to June 2011: CENTRAL; MEDLINE; EMBASE; CINAHL; PsycINFO; Maternity and Infant Care; LILACS; WorldCat (dissertations); ClinicalTrials.gov; China Masters' Theses; China Academic Journals; China Doctoral Dissertations; China Proceedings of Conference. We also searched the reference lists of relevant studies and reviews.

We included studies that randomised healthy parent-infant dyads (where the infant was under the age of six months) to an infant massage group or a 'no-treatment' control group. Studies had to have used a standardised outcome measure of infant mental or physical development.

Mean differences (MD) and standardised mean differences (SMD) and 95% confidence intervals (CIs) are presented. Where appropriate, the results have been combined in a meta-analysis using a random-effects model.

We included 34 studies, which includes one that was a follow-up study and 20 that were rated as being at high risk of bias.We conducted 14 meta-analyses assessing physical outcomes post-intervention. Nine meta-analyses showed significant findings favouring the intervention group for weight (MD -965.25 g; 95% CI -1360.52 to -569.98), length (MD -1.30 cm; 95% CI -1.60 to -1.00), head circumference (MD -0.81 cm; 95% CI -1.18 to -0.45), arm circumference (MD -0.47 cm; 95% CI -0.80 to -0.13), leg circumference (MD -0.31 cm; 95% CI -0.49 to -0.13), 24-hour sleep duration (MD -0.91 hr; 95% CI -1.51 to -0.30), time spent crying/fussing (MD -0.36; 95% CI -0.52 to -0.19), deceased levels of blood bilirubin (MD -38.11 mmol/L; 95% CI -50.61 to -25.61), and there were fewer cases of diarrhoea, RR 0.39; 95% CI 0.20 to 0.76). Non-significant results were obtained for cortisol levels, mean increase in duration of night sleep, mean increase in 24-hour sleep and for number of cases of upper respiratory tract disease and anaemia.Sensitivity analyses were conducted for weight, length and head circumference, and only the finding for length remained significant following removal of studies judged to be at high risk of bias. These three outcomes were the only ones that could also be meta-analysed at follow-up; although both weight and head circumference continued to be significant at 6-month follow-up, these findings were obtained from studies conducted in Eastern countries only. No sensitivity analyses were possible.We conducted 18 meta-analyses measuring aspects of mental health and development. A significant effect favouring the intervention group was found for gross motor skills (SMD -0.44; 95% CI -0.70 to -0.18), fine motor skills (SMD -0.61; 95% CI -0.87 to -0.35), personal and social behaviour (SMD -0.90; 95% CI -1.61 to -0.18) and psychomotor development (SMD -0.35; 95% CI -0.54 to -0.15); although the first three findings were obtained from only two studies, one of which was rated as being at high risk of bias, and the finding for psychomotor development was not maintained following following removal of studies judged to be at high risk of bias in a sensitivity analysis. No significant differences were found for a range of aspects of infant temperament, parent-infant interaction and mental development. Only parent-infant interaction could be meta-analysed at follow-up, and the result was again not significant.

These findings do not currently support the use of infant massage with low-risk groups of parents and infants. Available evidence is of poor quality, and many studies do not address the biological plausibility of the outcomes being measured, or the mechanisms by which change might be achieved. Future research should focus on the impact of infant massage in higher-risk groups (for example, demographically and socially deprived parent-infant dyads), where there may be more potential for change.