My mei tai's, half buckles, and full buckles vary in how they fit and how easy they are to modify to fit different sized children. I don't recommend wearing too big a size in half buckle/full buckle. Ideally a mei tai should also be the correct size but they are much easier to modify to fit than the other styles so can fit a wider size range. Mei Tai's and half buckles have no darts in the smaller sizes (so your baby will be held close to your body) but the toddler size does. Darts allow a wider/deeper seat without having to make the whole carrier wider and tend to make the whole carrier fit a bit bigger. Carriers with darts tend to hold your baby slightly away from your body (which transfers the weight mostly to your hips) so I have added darts to all my full buckles to help keep the weight off your shoulders since you cannot offset this weight by tyiing the shoulder straps as you can in a mei tai/half buckle.
If you have Flared Straps (padded to wrap) on your carrier you can use the spread out wrap part of the straps the extend the width of the seat for a child who has begun to outgrow it. It is not essential for a toddler to be knee to knee by the way (one of my daughter was happily carried occasionally up to five years old in a standard size carrier) but knee to knee does tend to be more comfortable and allows a better weight distribution for wearer and wearree.
Sizing is a guide only and is based on my average sized children plus some customer feedback I am always looking for more feedback so if you have any thoughts on sizing I would love to hear from you!
In general if your baby is on the smaller side of average you may get a longer use out of a particular size or if your child is at the top of the charts it may be outgrown sooner.
Quick size guide - if you baby is under a year old size 1 is best, if you baby is over a year size 2 is recommended, and if your baby is at least 18 months then choose toddler. Prefer a mei tai that will you can use across a large age range? - choose size 2 (standard). Want more detail? See below!
Size 1- baby size - from newborn to young toddler. Adjustable base option available (on custom carriers) for legs out carry from an early age. Click on the link for action photos and dimensions. This design has a curved top edge and straight sides but a straight top edge option is available.
Size 2- standard size - suitable for both babies and toddlers. This size has a wider and taller body to support the weight of your older baby and toddler well. Curved top edge for extra head/back support. This size fits best from around 6-8 months but can be used for younger babies with modifications. To use with a young baby the bottom can be rolled up to make it shorter and cinched with a ribbon to make it narrower or baby can be carried with legs froggied inside the carrier. The body is also slightly contoured so when you roll the bottom to make the mei tai shorter for a baby it will be narrower as well allowing a small baby to be more comfortably legs out. The mei can be used legs out (with the bottom rolled) from around 4-5 months. This size mei tai suits babies up to around 2-3 years.
Size 3 - toddler size - This carrier is taller and slightly wider than size 2, with seat darts for a deeper seat. This size fits from at least 18 months to around 3-4 years. Curved top edge and straight sides.
Mei Tais are the most versatile in how they fit. They will fit all sized wearers although if you are plus size you may like extra long straps for tying tibetan or if you are petite (less than a 23" waist) you may prefer petite waist padding to get your waist strap as tight as you like.
Mei Tais are easy to modify for a small baby by rolling the waist band to reduce height or by cinching the base with a ribbon to reduce width for legs out. Mei tai's can be worn apron or non apron style (wearing non apron will increase the height and wearing apron will reduce it). I can also add an adjustable base to your carrier which means you can adjust the width and the waistband will always lie nice and flat and it's easy to roll if you need to too.
The smallest size mei tai I make is 15" as I feel this is fairly easy to modify to fit a newborn and will not be outgrown too soon. A 14" carrier is a better fit for a very small baby and I did use this originally as my baby size but I found that my small to average daughter outgrew it by 12 months. I can make this size on request though if you don't need your carrier to be suitable for toddler wearing.
Please note baby and standard size mei tais have no darts to allow a close fit. I can make these sizes with darts on request but bear in mind they will fit slightly differently (in general they will fit bigger).
Half buckles are not as flexible as mei tai's in sizing and are meant to be worn non apron style. Like a mei tai you can roll the waist and wear apron style but it will sit a little diffferently. Like mei tai's this style of carrier is reversible - just remove the buckles and rethread the opposite way. Small babies can be worn froggied or with the base rolled and cinched (for legs out).
Although half buckles are designed to be worn non-apron style t is still possible to comfortably roll the waist to shorten the carrier or to wear apron style since the waist is padded rather than structured which can let you use the carrier sooner with a smaller baby. Baby size (size 1) will fit from newborn (with legs froggied in or with base rolled and cinched for young babies) until 18 months. An adjustable base in recommend for babies under four months old. You will need to roll the waist for a better fit for babies younger than 4-5 months in a legs out carry. Standard size (size 2) will fit best from around 8-10 months until around 2-3 years. Toddler size fits from around 18 months (small to average sized toddlers will fit best in this size from 2 years.
Measurements for half buckles - The length of the waist belt is 73cm including buckles, but I can make that smaller or longer if you need it. The length of the padded section is 63cm.
Please note baby and standard size mei tais have no darts to allow a close fit. I can make these sizes with seat darts on request but bear in mind they will fit slightly differently (in general they will fit bigger).
Full Buckle/Buckle Tai
Full buckles are the most convenient style of carrier to use but least flexible style sizing wise so I have added another sizing option (infant) to suit for smaller babies. You can cinch base with ribbon if the base is too wide but young babies cannot be carried with legs froggied. Babies under a year fit best in infant/baby size. 18 months is really the minimum age for toddler size (unless your child is very tall) as the body panel is quite tall. Small to average size toddlers will fit best in toddler size from around 2 years and will generally not fit comfortably before this.
Infant (35.5cm x 37cm/14" x 14.5") 4 months - 18 months
Baby/In between (38cm x 38cm/ 15"x 15") 6 months - 2 years
Standard (40.5cm x 42cm/16" x 16.5") 10 months - 2.5 years
Petite Toddler/ In between (43cm x 43cm/ 17"x17") 18 months - 3 years
Toddler (46cm x 46cm /18" x 18") - 2- 4 years
Preschool (48cm x 50cm) 19" x 20" - 3 years - 5 years
Standard Strap (16"/40cm) fits from 158cm to 180cm tall, Australian dress size 10 - 16. If you are outside this size range you may need petite or extra long straps. Petite straps are 14"/35cm and 18"/46cm for extra long. Fit adjusters/adjustable strap is available.
The adjustable base and height option added to on infant or baby size carrier will make your carrier suitable for a smaller baby than stated above. Babies vary in height so some babies may fit in the carrier sooner or later than others - just bear in mind that babies under four months must be well supported in the carrier with no slumping for optimal positioning.
You can choose use a shorter height size to suit a baby who likes arms out or to share between siblings (a toddler and preschooler for example). Some popular combinations are toddler width and standard height or preschool width and toddler height.
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