Table 2.
Number and percentage of parents reporting atypical development in each domain- and subdomain when their children were ≤ 6 and 7–12 months (n = 423)
| Domain-/Subdomain | ≤ 6 months | 7–12 months | |||
|---|---|---|---|---|---|
| n | % | n | % | ||
| Reported at least one area of atypical development across domains | 191 | 45.1% | 264 | 62.4% | |
| Language | 23 | 5.5 | 74 | 17.5 | |
| Delayed speech/vocalizations | 10 | 2.4 | 42 | 10.0 | |
| No speech/vocalizations | 11 | 2.6 | 20 | 4.7 | |
| Poor language comprehension | 0 | 0 | 2 | 0.5 | |
| Language regression | 2 | 0.5 | 10 | 2.4 | |
| Lack of language imitation | 0 | 0 | 4 | 0.9 | |
| Other | 0 | 0 | 2 | 0.5 | |
| Social development | 50 | 11.8 | 95 | 22.5 | |
| Delayed social communication | 14 | 3.3 | 6 | 1.4 | |
| No social communication | 6 | 1.4 | 17 | 4.0 | |
| Gaze abnormalities | 28 | 6.6 | 32 | 7.6 | |
| Poor social interaction | 8 | 1.9 | 28 | 6.6 | |
| Lack of response to social stimuli | 9 | 2.1 | 33 | 7.8 | |
| Social/non-verbal regression | 0 | 0 | 4 | 0.9 | |
| Lack of social imitation | 0 | 0 | 3 | 0.7 | |
| Other | 6 | 1.4 | 15 | 3.6 | |
| Stereotyped/restricted behavior | 57 | 13.5 | 87 | 20.6 | |
| Stereotyped movements | 15 | 3.6 | 26 | 6.2 | |
| Need for routine/rituals | 7 | 1.7 | 7 | 1.7 | |
| Stereotyped/restricted interests | 6 | 1.4 | 22 | 5.2 | |
| Preoccupation with parts of objects | 0 | 0 | 19 | 4.5 | |
| Hypo/hypersensitivity | 42 | 10 | 53 | 12.6 | |
| Motor development | 41 | 9.7 | 93 | 22 | |
| Motor delay | 16 | 3.8 | 76 | 18.0 | |
| Hypotonia | 12 | 2.8 | 8 | 1.9 | |
| Hypertonia | 2 | 0.5 | 5 | 1.2 | |
| Motor regression | 0 | 0 | 2 | 0.5 | |
| Lack of motor imitation | 0 | 0 | 1 | 0.2 | |
| Swallowing/Sucking | 8 | 1.9 | 3 | 0.7 | |
| Other | 12 | 2.8 | 16 | 3.8 | |
| Behavior/Temperament | 85 | 20.1 | 91 | 21.6 | |
| Lack of attention and interest | 17 | 4.0 | 25 | 5.9 | |
| Hyperactivity | 5 | 1.2 | 7 | 1.7 | |
| Passivity | 19 | 4.5 | 19 | 4.5 | |
| Tantrums/opposition | 7 | 1.7 | 13 | 3.1 | |
| Unsettled/crying/anxiety | 41 | 9.7 | 22 | 5.2 | |
| Aggression/violence | 0 | 0 | 5 | 1.2 | |
| Self-harm | 1 | 0.2 | 3 | 0.7 | |
| Extreme attachment to caregiver | 9 | 2.1 | 15 | 3.6 | |
| Other | 10 | 2.4 | 11 | 2.6 | |
| Medical issues | 39 | 9.2 | 26 | 6.2 | |
| Disorder | 40 | 9.5 | 5 | 1.2 | |
| Sickness | 4 | 0.9 | 12 | 2.8 | |
| Other | 16 | 3.8 | 10 | 2.4 | |
| Abnormal physiological function | 59 | 14 | 47 | 11.1 | |
| Sleeping | 43 | 10.2 | 31 | 7.3 | |
| Feeding | 25 | 5.9 | 24 | 5.7 | |
| Atypical physical features | 5 | 1.2 | 5 | 1.2 | |
| Unspecified concerns related to autism | 2 | 0.5 | 1 | 0.2 | |
| Other idiosyncratic development | 15 | 3.5 | 25 | 5.9 | |
Note: Items in bold are domains while indented, non-bolded items are subdomains. There were no subdomains for atypical physical features and unspecified concerns related to autism