A team from the University of Canterbury tracked 52 babies through their first year. They wanted to answer one question – which early behaviors predict sleep problems later?

Their answer surprised even them.

What They Actually Did

Jacqueline Henderson, Neville Blampied, and Karyn France asked parents to fill out detailed sleep diaries for 6 days every month. They even installed cameras in 54% of homes to verify the diaries matched reality.

At 6 months, they noticed something odd. The babies had naturally split into two distinct groups based on their sleep scores. Not a smooth range – two clear peaks. Good sleepers on one side, struggling sleepers on the other.

This pattern held at 12 months too, though more babies had moved to the good sleep group.

The 3 Warning Signs at 1 Month (And What They Really Mean)

Warning Sign #1: How Often Parents Stay Until Baby Falls Asleep

The numbers say:

• Future good sleepers – parents present 1.96 nights per week
• Future struggling sleepers – parents present 4.86 nights per week

What this actually means? Parents of good sleepers stay with baby until fully asleep about 2 nights out of 7. That is less than one-third of the time. The other 5 nights, they put baby down and leave while baby is still awake.

Parents of struggling sleepers stay almost 5 nights out of 7. That is nearly every night. Baby rarely experiences falling asleep without a parent there.

Warning Sign #2: Night Wakings

The numbers say:

• Future good sleepers – 6.69 wakings over 6 nights
• Future struggling sleepers – 10.22 wakings over 6 nights

What this actually means? Good sleepers wake about once per night (roughly 7 times in a week). Some nights they might not wake at all, other nights maybe twice.

Struggling sleepers wake almost twice per night (about 10-11 times per week). That’s nearly double the disruption.

Warning Sign #3: Total Sleep Amount

The numbers say:

• Future good sleepers – 878 minutes per day
• Future struggling sleepers – 801 minutes per day

Let’s translate those minutes:

• Good sleepers – 14 hours and 38 minutes total
• Struggling sleepers – 13 hours and 21 minutes total

That is a difference of 1 hour and 17 minutes every single day. Over a week, struggling sleepers miss almost 9 hours of sleep compared to good sleepers. That is similar to missing an entire night of sleep every week.

The Settling Activities

The researchers counted every single thing parents did to help baby back to sleep after waking – rocking, patting, singing, walking. They didn’t count necessary care like feeding or diaper changes.

• Future struggling sleepers – parents did 3.39 settling activities per night
• Future good sleepers – parents did 2.55 settling activities per night

That sounds small, right? Less than one extra intervention. But think about this over time.

• Over a week – 6 extra interventions
• Over a month – 25 extra interventions
• Over 6 months – 150 extra interventions

That is 150 extra times the baby learns “I need help to fall back asleep.”

How Accurate Are These Predictions? (This Will Surprise You)

Imagine you are working with 52 families with 1-month-old babies. Using just 3 simple observations – how often parents stay at bedtime, night wakings, and total sleep – you want to predict which babies will sleep well at 6 months.

Here is what happened when the researchers tried this…

They got it right for 49 out of 52 babies. That is 94% accuracy.

If you assessed 10 babies using these three markers:

• You would correctly predict 9 out of 10 outcomes
• Only 1 baby would surprise you

More specifically, at 6 months:

• Of 29 babies they predicted would sleep well, 28 actually did (only 1 surprise)
• Of 23 babies they predicted would struggle, 21 actually did (only 2 surprises)

Think about what this means. When you tell a parent, “Based on these early patterns, your baby is likely to develop sleep challenges,” you can be 91% confident you are right.

By 12 months, the predictions were still 85% accurate. Not quite as precise, but still correct for 44 out of 52 babies. That is correctly predicting 8-9 out of every 10 cases in your practice.

Important Study Limitations

• Sample size: Only 52 babies
• Demographics: All two-parent, middle-class families from New Zealand
• Feeding: 89% breastfed (couldn’t analyze formula vs. breastfeeding effects)

What About Natural Development?

Between 6 and 12 months:

• 21% of babies (about 1 in 5) naturally moved from poor to good sleep
• Only 1 baby regressed from good to poor sleep

This means some babies will improve without intervention, but if a baby struggles at 6 months, there is still a 64% chance they will struggle at 12 months without help.

Sleep Consultant Training Program

Working with 1-month-old babies requires understanding newborn sleep physiology and early development patterns.

The International Institute of Infant Sleep covers the full spectrum of infant sleep from birth through toddlerhood. The curriculum includes newborn sleep patterns, how sleep develops in the first months, and the science behind early sleep patterns. Students who study to become sleep consultants learn which behaviors are normal for newborns and which ones need attention.

When parents ask why you are suggesting specific changes for their 1-month-old, you need solid knowledge to explain it clearly. Understanding the research, like this University of Canterbury study, helps you build trust with families who want evidence-based guidance for their baby’s sleep.

This University of Canterbury research gives you scientific backing for what many consultants have observed – early patterns matter. Now you have the evidence to support early, gentle intervention that can prevent months of sleep struggles for families.

Reference: Henderson, J. M. T., Blampied, N. M., & France, K. G. (2020). Longitudinal Study of Infant Sleep Development: Early Predictors of Sleep Regulation Across the First Year. Nature and science of sleep, 12, 949–957. https://doi.org/10.2147/NSS.S240075