The lifelong impact of early touch

In the 1950s, the American psychologist Harry Harlow provided a stark demonstration of the importance of a mother’s touch. He famously – and controversially – showed that rhesus monkeys would rather cling to a surrogate “mother” made of soft cloth than one made of metal wire that provided milk. A loving touch seemed to be more important than food, Harlow concluded.

Today, the importance of touch has become firmly embedded in infant care. For example, UNICEF and the NHS recommend skin-to-skin contact between a parent and newborn. This involves placing a newborn on a parent’s bare chest, both of them covered in a warm blanket, for at least an hour after birth or until after the first feed.

In fact, feeling the power of touch begins long before a baby is even born. Touch is the first sense to develop. Just eight weeks after conception, a foetus already responds to the sensation of touch in the womb – and it is crucial for people of any age.

By 14 weeks, twins have been observed on ultrasound sucking on each other’s fingers and exploring each other’s faces. And frame-by-frame analyses of ultrasound have shown that, by 20 weeks, foetuses respond to mothers touching their bellies.

The benefits of parental touch become clear at birth. One review of 52 studies involving over 4,000 newborns found that touch interventions – such as skin-to-skin contact and baby massage – was associated with better newborn health, including better regulation of temperature, breathing and heart rate. The review also found that touch was more beneficial when it came from a parent compared to medical staff.

Cuddle up, because there are other benefits of skin-to-skin contact. When a parent holds their baby in skin-to-skin contact after birth, it helps to calm the newborn and stimulates an interest in feeding. In the longer-term, daily skin-to-skin contact with infants improves sleep patterns and pain tolerance, supports healthy weight gain and continued breastfeeding and strengthens brain development.

These benefits are also experienced by infants born prematurely. For example, one review of kangaroo care – skin-to-skin contact for premature or low birth-weight infants – found that it reduced the risk of death, infection and low body temperature, and improved weight gain and rates of breastfeeding.

In both healthy and premature infants, skin-to-skin contact also triggers the release of the hormone oxytocin – the so-called “love hormone” – which encourages bonding between the parent and infant. Skin-to-skin contact also lowers levels of the hormone cortisol, which helps newborns to regulate levels of stress.

In fact, the benefits of skin-to-skin contact are not exclusively experienced by the newborn. Studies have found that daily skin-to-skin contact with their babies can reduce symptoms of postpartum stress, depression and anxiety in mothers. And while most studies have focused on mothers, skin-to-skin contact also seems to reduce symptoms of depression and anxiety in fathers.

While most of this research has focused the short-term outcomes of touch, scientists are also following infants over time to see what impact early touch has on long-term outcomes. For example, one study found that premature babies who received at least one hour of kangaroo care for two weeks had better mother-child interactions, sleep and brain development when they were ten years old.

Another group of researchers followed infants and their mothers for a period of nine years. When they were only one-month-old, infants who had experienced skin-to-skin contact with their mothers already showed better emotional adjustment and attachment than infants who had no skin-to-skin contact.

Nine years later, these children were also more willing and able to engage in emotive conversations with their mothers.

Some of the effects of touch are more difficult to quantify. In the 1970s, for example, the psychiatrist Donald Winnicott described how a mother’s touch helps infants and young children to experience the body as “the place where one securely lives”. This idea seems to be supported by ethnographic records and anthropological studies of communities where infants are in close contact with a caregiver.

For instance, in many communities – such as the Netsilik, !Kung, and Balinese – infants are pressed skin-to-skin with their mothers for much of the day. This means that infants are more likely to have their needs met quickly – being comforted when they cry or fed when they suckle – while also helping them develop a sensitivity to touch. These forms of “skinship” also help parents and their infants to develop deeper bonds through touch.

While this research shows the benefits of touch in infancy, what about childhood? Studies of young children and adolescents have shown that touch – particularly caring touch like hugging from a parent or other caregivers, such as teachers – can support psychological development and wellbeing. For instance, touch can help children develop a sense of emotional security, belonging and feelings of support, especially in stressful situations.

The anthropologist Marjorie Goodwin has described how “haptic rituals” – such as hugs between a parent and their child over the course of a day – can help the child feel loved and cared for.

Regularly experiencing caring touch can also help children to develop their social interaction skills, including empathy toward others. Caring touch also reduces aggressive behaviour in adolescence.

Unfortunately, even today, many parents hold on to old fashioned ideas – popularised by psychologists like John Watson – that they should avoid caring touch with their children, out of fear that hugging or cuddling will cause their children to become weak willed. The scientific evidence doesn’t support such ideas, so go hug your kids.

This article is republished from The Conversation under a Creative Commons license. Read the original article.