title: Growth during infancy and early childhood in relation to blood pressure and body fat measures at age 8-18 years of IVF children and spontaneously conceived controls born to subfertile parents.
abstract: BACKGROUND
  Little is known about post-natal growth in IVF offspring and the effects of rates of early post-natal growth on blood pressure and body fat composition during childhood and adolescence.
  
  
  METHODS
  The follow-up study comprised 233 IVF children aged 8-18 years and 233 spontaneously conceived controls born to subfertile parents. Growth data from birth to 4 years of age, available for 392 children (n = 193 IVF, n = 199 control), were used to study early post-natal growth. Furthermore, early post-natal growth velocity (weight gain) was related to blood pressure and skinfold measurements at follow-up.
  
  
  RESULTS
  We found significantly lower weight, height and BMI standard deviation scores (SDSs) at 3 months, and weight SDS at 6 months of age in IVF children compared with controls. Likewise, IVF children demonstrated a greater gain in weight SDS (P < 0.001), height SDS (P = 0.013) and BMI SDS (P = 0.029) during late infancy (3 months to 1 year) versus controls. Weight gain during early childhood (1-3 years) was related to blood pressure in IVF children (P = 0.014 systolic, 0.04 diastolic) but not in controls. Growth during late infancy was not related to skinfold thickness in IVF children, unlike controls (P = 0.002 peripheral sum, 0.003 total sum). Growth during early childhood was related to skinfold thickness in both IVF and controls (P = 0.005 and 0.01 peripheral sum and P = 0.003 and 0.005 total sum, respectively).
  
  
  CONCLUSIONS
  Late infancy growth velocity of IVF children was significantly higher compared with controls. Nevertheless, early childhood growth instead of infancy growth seemed to predict cardiovascular risk factors in IVF children. Further research is needed to confirm these findings and to follow-up growth and development of IVF children into adulthood.
authors: Department of Paediatrics, Institute for Clinical and Experimental Neuroscience, VU University Medical Center, De Boelelaan 1117, 1081 HV Amsterdam, The Netherlands.
authors: Manon
authors: M
authors: Ceelen
authors: Mirjam M
authors: MM
authors: van Weissenbruch
authors: Janneke
authors: J
authors: Prein
authors: Judith J
authors: JJ
authors: Smit
authors: Jan P W
authors: JP
authors: Vermeiden
authors: Marieke
authors: M
authors: Spreeuwenberg
authors: Flora E
authors: FE
authors: van Leeuwen
authors: Henriette A
authors: HA
authors: Delemarre-van de Waal
mesh_terms: D000293:Adolescent; D001794:Blood Pressure; D050218:Body Fat Distribution; D001827:Body Height; D015992:Body Mass Index; D001835:Body Weight; D002648:Child; D002657:Child Development; D002675:Child, Preschool; D005307:Fertilization in Vitro; D005500:Follow-Up Studies; D006801:Humans; D007223:Infant; D007231:Infant, Newborn