Cannabis and Breastfeeding

Table 1

Mean motor development scores^∗ corresponding with cannabis exposure during gestation and lactation [23].

	Motor Development PDI
Days of infant Cannabis exposure	Mean
Trimester one
0	105 (𝑛=84)
1 to 44	99 (𝑛=36)
45 to 90	93 (𝑛=16)
Trimester two
0	102 (𝑛=98)
1 to 44	104 (𝑛=25)
45 to 90	94 (𝑛=13)
Trimester three
0	101 (𝑛=94)
1 to 44	107 (𝑛=28)
45 to 90	94 (𝑛=14)
Lactation month one
0	102 (𝑛=81)
1 to 44	106 (𝑛=38)
45 to 90	90 (𝑛=17)
Lactation month three
0	102 (𝑛=84)
1 to 44	103 (𝑛=28)
45 to 90	97 (𝑛=13)

∗Motor developmental scores (Psychomotor Development Index, PDI) were from Bayley Scales of Infant Development. During the first trimester, PDI decreased with increasing cannabis exposure (test for linear trend, 𝑃=.005). During the first lactation month, mean PDI for the higher exposure group was lower than the PDI for the no or low exposure groups (one-way ANOVA 𝑃=.008).