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| Regularity | |||
|---|---|---|---|
| Month | 1 | 6 | 12 |
| Mean | 2.5 | 3.5 | 3.9 |
| SD | 0.9 | 0.7 | 0.6 |
| p-value for possible differences between months | 0.000* | 0.000** |
Scale 1–5 where increased numbers represent increased regularity. Standard deviation (SD), Baby and Behavior Questionnaire (BBQ).
*Between month one and six
** Between month six and twelve
