diff --git a/.bumpversion.cfg b/.bumpversion.cfg
index ab23751..ce461d3 100644
--- a/.bumpversion.cfg
+++ b/.bumpversion.cfg
@@ -1,5 +1,5 @@
 [bumpversion]
-current_version = 4.2.6
+current_version = 4.2.7
 tag = False
 commit = True
 
diff --git a/rcpchgrowth/age_advice_strings.py b/rcpchgrowth/age_advice_strings.py
index d049610..2fc58a8 100644
--- a/rcpchgrowth/age_advice_strings.py
+++ b/rcpchgrowth/age_advice_strings.py
@@ -8,11 +8,23 @@ def comment_prematurity_correction(
     """
 
     if chronological_decimal_age == corrected_decimal_age:
-        # no adjustment has been made so the child was born at 40 weeks
+        # no adjustment has been made so the child was born at 40 weeks or this child is being plotted on the CDC reference, where no adjustment is made for 37-42 weeks or beyond the age of 2 years
             lay_corrected_decimal_age_comment = "Your child was born on their due date."
             clinician_corrected_decimal_age_comment = "Born at term. No correction has been made for gestation."
             lay_chronological_decimal_age_comment = "Your child was born on their due date."
             clinician_chronological_decimal_age_comment = "Born Term. No correction has been made for gestation."
+            # These fields should only apply to CDC reference, since UK-WHO corrects for all gestations (and therefore corrected_decimal_age will never be equal to chronological_decimal_age if gestation_weeks is not 40)
+            if gestation_weeks < 42:
+                if gestation_weeks < 37:
+                    lay_chronological_decimal_age_comment = f"Your child was born at {gestation_weeks}+{gestation_days} weeks gestation. No correction is made for this beyond 2 years of age."
+                    clinician_chronological_decimal_age_comment =f"Born preterm at {gestation_weeks}+{gestation_days} weeks gestation. No correction is made for this beyond 2 years of age."
+                    lay_corrected_decimal_age_comment = f"Your child was born at {gestation_weeks}+{gestation_days} weeks gestation. No correction is made for this beyond 2 years of age."
+                    clinician_corrected_decimal_age_comment = f"Born preterm at {gestation_weeks}+{gestation_days} weeks gestation. No correction is made for this beyond 2 years of age."
+                else:
+                    lay_chronological_decimal_age_comment = f"Your child was born at {gestation_weeks}+{gestation_days} weeks gestation. This is considered term and no correction for gestation has been made."
+                    clinician_chronological_decimal_age_comment = f"Born at term at {gestation_weeks}+{gestation_days} weeks gestation. No correction for gestation has been made."
+                    lay_corrected_decimal_age_comment = f"Your child was born at {gestation_weeks}+{gestation_days} weeks gestation. This is considered term and no correction for gestation has been made."
+                    clinician_corrected_decimal_age_comment = f"Born at term at {gestation_weeks}+{gestation_days} weeks gestation. No correction for gestation has been made."
     elif chronological_decimal_age > corrected_decimal_age or chronological_decimal_age < corrected_decimal_age:
         ## adjustment for gestational age has been made - even if >=37 weeks
         lay_corrected_decimal_age_comment = f"Because your child was born at {gestation_weeks}+{gestation_days} weeks gestation an adjustment has been made to take this into account."
diff --git a/rcpchgrowth/measurement.py b/rcpchgrowth/measurement.py
index 9596f71..7f7a362 100644
--- a/rcpchgrowth/measurement.py
+++ b/rcpchgrowth/measurement.py
@@ -395,6 +395,11 @@ def __calculate_ages(
             gestation_weeks = 40
         # calculate ages from dates and gestational ages at birth
 
+        # if reference is CDC, we must treat >37 week infants as term.
+        if self.reference == CDC and gestation_weeks >= 37:
+            gestation_weeks = 40
+            gestation_days = 0
+
         try:
             self.corrected_decimal_age = corrected_decimal_age(
                 birth_date=birth_date,
@@ -412,6 +417,10 @@ def __calculate_ages(
         except Exception as err:
             self.chronological_decimal_age = None
             chronological_decimal_age_error = f"{err}"
+        
+        # if the reference is CDC, we also stop correcting for prematurity at 2 years of age
+        if self.reference == CDC and self.corrected_decimal_age >= 2:
+            self.corrected_decimal_age = self.chronological_decimal_age
 
         if self.corrected_decimal_age is None:
             self._age_comments = None
diff --git a/setup.py b/setup.py
index 70d70d2..a495aa7 100644
--- a/setup.py
+++ b/setup.py
@@ -8,7 +8,7 @@
 
 setup(
     name="rcpchgrowth",
-    version="4.2.6",
+    version="4.2.7",
     description="SDS and Centile calculations for UK Growth Data",
     long_description=long_description,
     url="https://github.com/rcpch/digital-growth-charts/blob/master/README.md",