Colson and colleagues conducted a descriptive study to explore how primitive newborn reflexes (PNRs) affect breastfeeding behavior, and to describe and compare those reflexes observed during biological nurturing and in other feeding positions.
They begin by describing the positioning and latch techniques used by most mothers. These include a side-lying or upright position in which the baby is “[placed] ‘tummy to mummy’ at the breast level; then they attach the baby, positioning nose to nipple, leading with the chin following mouth gape. Previous trials, however, have demonstrated few benefits associated with this approach.” The investigators therefore looked at the mechanisms of behaviors and positions collectively termed Biological Nurturing (BN).
How did researchers design the study?
Forty mother and newborn pairs were observed and videotaped during the first month after birth, either at the hospital or in their homes. Alternative positions were suggested to the mother only if the dyad experienced feeding problems. Clear operational definitions were provided for breastfeeding, PNRs, neonatal position, neonatal lie, neonatal behavioral state, maternal posture, successful breastfeeding, and other observations.
- During 24 hours of footage, 20 reflexes were identified during a total of 93 episodes occurring in 50 sittings.
- There were three observers, and an inter-rater reliability of 93 percent.
- The results showed that every mother-baby dyad achieved a successful feeding during the “best” episode.
- The 20 PNRs were described; they fell into 4 categories. The PNRs clustered into two functional groups: (1) finding/latching and (2) milk transfer.
What did they learn about reflexes?
The “best episode” of breastfeeding describes the mothers’ and babies’ postures (BN) and compares the mean number of PNRs when in those postures. Specifically, they found that during the “best” episode,
- 21 mothers were upright (in non-BN postures),
- 2 were in partial BN postures (one lying flat, one side-lying)
- 17 were in a full BN semi-reclined posture.
During this “best” episode, the mean number of PNRs is 11.6 when the mother was in a non-biological nurturing posture, compared to 15.9 when in full BN postures. “A significantly greater number of PNRs were observed, aiding latch and sustaining feeding when mothers were in full BN postures (p ≤0.0005). When problems occurred and mothers changed to a full BN postures, gulping and gagging was reduced, and “the baby often became the active agent controlling the feed, aided by the different types of PNRs.”
Summing up the study
This is apparently the first study describing maternal posture having a significant impact on the process of successful latching and suckling. Although previous studies addressed the role of rooting, suckling and swallowing, this study looked at 17 other PNRs as related to feeding.