Quality · April 13, 2026 · 12 min read
The bodysuit and bloomer are fundamental pieces in any babywear collection. Seemingly simple, their manufacturing requires advanced technical expertise: choosing soft, certified materials, anti-irritation flatlock seams, nickel-free snaps, and compliance with European standards. This guide details each step for brands looking to launch or optimize their range of baby basics.
A baby bodysuit is not a simple garment. It's the most-worn piece of clothing by an infant—in direct contact with the skin 24/7, put on and taken off several times a day, and washed at high temperatures every week. It must be comfortable without constricting, durable without being stiff, and perfectly safe with no potentially hazardous elements.
The bloomer, worn alone in summer or under a dress, must allow for complete freedom of movement (sitting, crawling, first steps) while staying in place thanks to calibrated elastics that do not mark the skin. The diaper area requires extra volume that the pattern must accommodate.
These constraints make the bodysuit and bloomer more technically demanding than an adult shirt. The most common mistakes made by new brands include: necklines that are too tight (impossible to put on), poorly positioned snaps (discomfort during changing), and irritating seams (poorly adjusted overlock or wrong thread type).
The choice of bodysuit type depends on the baby's age and the intended use. Each type involves specific pattern-making and assembly constraints:
| Type | Age | Opening | Technical Specificity |
|---|---|---|---|
| Kimono bodysuit | 0-3 months | Side (wrap-style) | Does not pass over the head, side ties or snaps |
| Envelope neck bodysuit | 3-24 months | Expandable neckline | Neckline with shoulder overlap (1:1.5 ratio) |
| Polo bodysuit | 6-24 months | Front buttons | Set-in collar, button placket, more formal |
| Long-sleeve bodysuit | 0-24 months | Variable | Ribbed cuffs, integrated mittens (0-3 months) |
The choice of fabric determines the comfort, durability, and positioning of the garment. At LOI Confection, we primarily work with three types of knits:
Other materials are possible: cotton poplin for dressy bloomers, linen blends for high-end summer items, and double gauze for organic collections. We offer both the Full Package model (we source the materials) and CMT (you provide your fabrics).
1. Pattern making and grading. Pattern making for a baby bodysuit requires special precision: head openings must be wide enough (envelope neckline with a 1:1.5 opening ratio), armholes comfortable, and snaps positioned to facilitate changing. Each size is graded according to infant body standards (from preemie to 24 months), with specific increments for infant proportions—a baby does not grow proportionally like a child.
2. Cutting. Cutting is done on stacked fabric layers (8 to 12 plies depending on the jersey's thickness), respecting the grainline and elasticity of the knit. A jersey cut off-grain will twist after washing. For bloomers, piece placement optimizes fabric consumption (target fall-off rate: less than 12%) while respecting the grainline for a regular drape.
3. Assembly and sewing. The seams of a baby bodysuit are made with a 4-thread overlock for strength and comfort (no irritating seams on the skin). Tension adjustment is crucial: if too tight, the overlock seam breaks when stretched over the head; if too loose, it puckers. Neckline bindings are applied flat with a specific attachment. Bloomer elastics are inserted into a sewn-in casing, with tension calibrated by the machine to avoid marking the skin.
4. Attaching snaps and finishing. The crotch snaps of the bodysuit are applied nickel-free (REACH compliant). The four-part snap (cap + stud + socket + post) is attached with a pneumatic press, with control over the closing force. Each snap is tested for pull-out resistance (minimum 50 N). Composition labels are sewn flat, never as a flag label, to prevent any irritation.
5. Quality control. Each piece undergoes a 7-point inspection: checking measurements (tolerance of ±5 mm), snap strength, absence of loose threads, label compliance, neckline symmetry, overlock regularity, and overall cleanliness. An AQL 2.5 inspection is performed on the batch before shipment, with a photo report.
The baby bloomer has its own set of constraints that distinguish it from a bodysuit. It is a bottom garment that must accommodate the volume of a diaper while allowing complete freedom of movement.
The pattern for a bloomer must incorporate extra volume at the crotch to accommodate a diaper without constriction. The target ease is +4 to +6 cm compared to the naked body. The crotch depth is greater than on a classic child's short, and the waistband must sit above the diaper without slipping.
The waist and thigh elastics are the most delicate point. An elastic that is too tight marks and irritates the skin; if too loose, the bloomer slips down. We use 15 mm wide flat elastics for the waist and 10 mm for the thighs, inserted into a casing with a calibrated stretch rate (elastic-to-fabric ratio of 1:1.6 for the waist, 1:1.4 for the thighs).
For formal collections, the bloomer can be made from cotton poplin with an inverted pleat in the front, patch pockets, or a leg cuff. These finishing touches add manufacturing steps but position the product in the premium segment. See our article on ceremonial dresses and sets for coordinating pieces.
The manufacturing of baby clothing in Europe is regulated by strict standards. At LOI Confection, we integrate these requirements from the design stage:
For a complete guide to applicable standards, see our article on safety standards EN 14682 and REACH.
Every bodysuit and bloomer produced in our factory undergoes a systematic quality control check. Our return rate is below 1% thanks to this rigorous process:
An AQL 2.5 inspection is then performed on the batch before shipment, with a photo report sent to the client. This is the standard required by major European children's fashion clients.
The kimono-style (or wrap-style) bodysuit opens on the side, allowing it to be put on without passing it over the infant's head—ideal for newborns. The classic bodysuit is pulled on over the head thanks to an expandable envelope neckline and fastens with snaps at the crotch.
For an all-season bodysuit, a 160 to 180 g/m² jersey offers the best balance of softness and structure. In summer, a 130 to 150 g/m² jersey is lighter. In winter, a 200 to 220 g/m² interlock provides more warmth. The weight also affects the dye's appearance and wash stability.
Snaps must comply with the REACH regulation, which limits nickel content to 0.5 µg/cm²/week. At LOI Confection, we use certified nickel-free snaps. Each batch is tested for pull-out resistance (minimum 50 N) to prevent any risk of ingestion.
A quality cotton jersey bodysuit (160-180 g/m², combed cotton) can withstand 50+ washes at 40 °C without significant deformation or pilling. The key factors are the quality of the cotton (long fibers), the knit density, and the type of seam (4-thread overlock with elasticity).
Yes. Our GOTS certification covers the entire manufacturing process, including embroidery threads. We use GOTS-certified threads for embroideries on organic pieces, which maintains the final product's certification. Hand-embroidered initials on a GOTS organic jersey bodysuit are a best-seller.