Size Chart - Duo Collection 3
| Neck | Chest | Waist | Back | Approx Weight | Age> | |
| Size 1 (S) | 8" (20cm) |
9–10.2" (23–26cm) |
12" (30cm) |
9.5–10.6" (24–27cm) |
2.0–3.0 lbs | 3–4 months |
| Size 2 (M) | 9" (23cm) |
11.2–13" (28–33cm) |
15" (38cm) |
11–11.8" (28–30cm) |
4.0–5.5 lbs | 5–6 months |
| Size 3 (L) | 9" (23cm) |
13.1–15.1" (33–38cm) |
16" (41cm) |
12.2–13" (31–33cm) |
5.5–7.0 lbs | 7–8 months |
| Size 4 (XL) | 9" (23cm) |
15–17" (38–43cm) |
18" (46cm) |
13.4–14.2" (34–36cm) |
7.0–9.0 lbs | 9–11 months |
| Size 5 (XXL) | 10" (25cm) |
17–19" (43–48cm) |
19" (48cm) |
14.6–15.8" (37–40cm) |
10.0–12.0 lbs | Adult |