fɔːɹ bˈoʊθ bˈɔɪz ænd ɡˈɜːlz ðɛɹˌɑːɹ tˈuː sˈɛts ʌv tʃˈɑːɹts: wˈʌn fɔːɹ ˈɪnfənts ˈeɪdʒᵻz zˈiəɹoʊ tə θˈɜːɾi sˈɪks mˈʌnθs ænd ɐnˈʌðɚ fɔːɹ ˈeɪdʒᵻz tˈuː ænd əbˈʌv.
For both boys and girls there are two sets of charts: one for infants ages 0 to 36 months and another for ages 2 and above.