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Wonder Weeks and Developmental Leaps- The Struggle is REAL!

04/03/2022 1:42 PM | Anonymous member (Administrator)

We are excited to announce a very special upcoming event in April: All About Naps with Sarah Healy. To get us all prepared for the event, Sarah is addressing three of the most common issues parents face with sleeping through guest blog posts February through April.

Over the years, I have hosted numerous classes and private consultations and I often get questions about the sudden change in baby's behavior. The questions come in many forms, such as:

  • "What exactly are these 'Wonder Weeks' that everyone talks about?"
  • "What exactly IS this dreaded 4 month regression?"
  • “My baby was sleeping really well at night—going 5-6 hours stretches—and then all of a sudden she started waking up frequently and I can’t figure out what is going on.”

Sometimes an increase in wakefulness at night can be due to sickness or teething, but often this change in sleep pattern is due to a developmental leap—or what Dr. Hetty van de Rijt and Dr. Frans X. Plooij have called the Wonder Weeks.  Authors van de Rijt and Plooij have studied babies for over 35 years and they have discovered that babies go through eight developmental milestones in the first year of life (10 in the first 20 months!) right around the same week of life.

In this time, there is an increase in brain activity—think of it as your baby’s brain firing and wiring new neural pathways—which can cause a change in behavior.

What does it look like?

  • Increased wakefulness at night (sometimes happy and wakeful, sometimes fussy)
  • Clingy and cranky
  • Crying more than normal
  • Increased need to be fed (due to a wish for comfort)
  • Trouble napping or going to sleep
  • Change in ease of routine

When do these occur?

Unless your baby was born premature, most babies go through these developmental leaps at the following times:

  • 5-6 weeks

  • 8-9 weeks

  • 12 weeks

  • 19-20 weeks

  • 25-26 weeks (6 months)

  • 33-37 weeks

  • 43-47 weeks

  • 55 weeks (just after first birthday)

Why is this important to you as a parent?

      At the early developmental leaps, your baby is noticing patterns, images, sensations and forming crucial relationships. As they get older (19 weeks and older) their developmental leaps coincide with a movement milestone such as rolling, crawling, pulling to standing and walking. As they integrate patterns and relationships, or as they learn a new movement there is a marked increase in brain activity which can present to parents as clingy, fussy and unpredictable.

      While this can be frustrating and lead to less sleep for everyone, I assure you, your baby is doing exactly what she or he needs to be doing and it is a really good sign of important development.

      During these periods, researchers and experts alike suggest various activities that can help with this stage in your child’s learning. The book Wonder Weeks or the app can offer some of these suggestions.

      • During the periods when a developmental leap is occurring, it is generally not a great time to start sleep changes as your little one will need extra support and connection and will likely resist sleep changes.

      • Do your best to offer more comfort, be patient and take deep breaths.

      • Maintain as much consistency with bedtime as possible and comfort at night when your baby wakes.

      During this time your baby will be taking on so many new motor skills, increasing their perception, and integrating important information about the world around them…and it is a lot of work!

      These periods during the Wonder Weeks can be frustrating and unpredictable therefore as parents it is crucial that we prioritize self care and practice patience so we can support our babies as they learn and navigate through their first year of life.  If you’re struggling, please consider signing up for my All About Naps class on April 16th, from 10-11am at McNear Park through the Petaluma Mothers Club.

      About Sarah:

      Sarah Healy, MA is a mother of two, Certified Infant Sleep Consultant, and parent coach specializing in the transitions that occur in the first year after the birth of a child. She holds a masters in psychology and has devoted 20 years of her career to infant and child development, and family support. Sarah uses an evidence based approach to her sleep classes and draws from a multidimensional approach in understanding the various situations that occur with sleep and families.

      For more information about Sarah or additional sleep tips, check out her website or follow her on social media. 



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