In child language, these two consonantal oppositions (nasal vs. oral stop, labials vs. dentals) are followed by the first vocalic opposition: a more narrow vowel is opposed to the wide vowel.
Standardized
IF there is vocalic opposition of wide vs. narrow, THEN there are two consonantal oppositions: nasal vs. oral stops and labials vs. dentals.
1. Explicitly stated as a universal acquisitional sequence, but can be assumed to be intended also as a universal implication. 2. See discussion in Hawkins (1987).
1. Explicitly stated as a universal acquisitional sequence, but can be assumed to be intended also as a universal implication. 2. See discussion in Hawkins (1987).