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Progression of the intervention.
| 0–2 weeks | Participant will be intervened in the mother's lap (A) |
| 2–4 weeks | A + Participant will be intervened in an inclined position to 45° (B) |
| 4–6 weeks | A + B + Participant will be intervened in supine position (C) |
| 6–8 weeks | A + B + C + Participant will be intervened in prone position (D) |
| 8–16 weeks | A + B + C + D |
