Obsidian Sprout Newborn Carrier: Newborn Fit Checklist

By hope&plum | Published: 2026-11-02

Category: How-to Guides

Use this step-by-step newborn carrier fit checklist to adjust the Obsidian Sprout for a secure, comfortable carry—covering seat depth, shoulder straps, and common mistakes.

Quick answer

Start with the carrier's length option that matches your frame, then adjust the seat and shoulder straps so your newborn sits high, visible, and close enough to kiss. Work through the checklist below in order before every carry.

Why the length option is your first fit decision

The Obsidian Sprout comes in Short (XXS–L) and Long (XL–6X) lengths. Choosing the right length before you touch the straps prevents you from maxing out the adjusters or leaving excess webbing that can loosen over time.

If you fall between sizes, size down only if the carrier still lets you tighten the shoulder straps enough to keep your newborn snug; otherwise choose the longer option for comfort.

When a secure fit still feels wrong

A fit that passes every checkpoint can still feel off if your newborn is dressed in bulky clothing or if you're wearing the carrier over a thick jacket. Remove excess layers or adjust the carrier after layering so the seat and straps stay snug.

If your newborn's chin drops toward their chest or their face is covered, stop and redo the fit from the seat adjustment step—do not simply tighten the shoulder straps.

Newborn fit checklist for the Obsidian Sprout

Choose your length option: Select Short (XXS–L) or Long (XL–6X) based on your frame. Put the carrier on before adding your newborn so you can feel where the straps sit. If the shoulder straps are already near their tightest setting before your newborn is in, you may need the other length.
Set the seat depth: Adjust the seat so your newborn's bottom is supported knee-to-knee, with their legs in a natural M position. A common mistake is leaving the seat too narrow, which lets the legs dangle. Check that the seat fabric reaches the back of both knees, not just the thighs.
Position your newborn high and visible: Place your newborn in the carrier so their head is close enough to kiss and their face is always visible. Their chin should never drop toward their chest. If you can't see your newborn's face without moving fabric, raise them before continuing.
Tighten the shoulder straps: Pull the shoulder straps evenly until the carrier feels snug against your body. A common mistake is over-tightening one side, which twists the seat and pulls your newborn off-center. Slide a flat hand under the shoulder strap—it should feel firm but not pinch.
Check the back panel and neck support: The back panel should reach the base of your newborn's neck, not higher. If the panel covers the ears or presses on the head, the seat may be too deep or the carrier too long for your newborn's current size. Your newborn's head should be free to turn side to side.
Do a final mirror check: Look in a mirror from the side: your newborn's ear, shoulder, and hip should form a straight line, and their back should be gently rounded. Recheck after five minutes of walking, since straps can settle. If anything has shifted, redo the shoulder strap and seat steps—not just the straps.

Product facts

Obsidian Sprout Newborn Carrier: Available in Short (XXS–L) and Long (XL–6X) lengths. Choosing the length that matches your frame gives you enough adjustment range to tighten the carrier properly for a newborn.
Obsidian Sprout Newborn Carrier