Yes, Changelings in D&D can change their weight as part of their shapeshifting, but it's usually within the mechanical limits of their size category (Medium), meaning they can become heavier or lighter like a stout dwarf or a slender elf but can't become Small or Large, though some Dungeon Masters might allow shifting between Medium and Small sizes with corresponding weight changes. Their transformation is biological/innate rather than magical, allowing for significant alterations in appearance, height, and weight as long as they maintain their core size.
You can also adjust your height and weight, but not so much that your size changes. Note, you cannot change your size, so becoming a Gnome (Small) is not possible, as Changelings are Medium.
Changeling can change their shape to a height and weight of whatever they wish, but not to the point that it changes their size. A medium sized changeling can change its appearance into that of a dwarf or a half orc or even a hag, but not a small child or halfling or a Goliath.
The Archive of Disease in Childhood notes that the changeling is ``characterized by unresponsiveness, resistance to physical affection, obstreperousness, inability to express emotion, and unexplained crying and physical changes such as rigidity and deformity. Some are unable to speak.''
Ageing slightly faster than humans, changelings are considered mature at around age 15 but have roughly the same lifespan as a human, typically up to 100 years and as much as 110.
Among the diseases or disabilities with symptoms that match the description of changelings in various legends are spina bifida, cystic fibrosis, PKU, progeria, Down syndrome, homocystinuria, Williams syndrome, Hurler syndrome, Hunter syndrome, autism spectrum disorder, Prader-Willi Syndrome, and cerebral palsy.
The short version is that a Changeling can shapeshift to a form that can produce sperm to impregnate someone, and can shapeshift to a form with a uterus and eggs to get pregnant, but a pregnant Changeling cannot shapechange to a form without a uterus without ending the pregnancy.
Due to their unique biology Changelings do not have active fertile cycles. Instead, a Changeling actually makes a conscious decision to begin a fertile cycle that lasts for two days, but repeats the cycle every fifteen days.
A changeling eats the same food as humans, but possess a stronger fortitude and are able to eat rotten food or raw meat (though most prefer not to).
Appearance. In their true form, or their form "at rest", changelings have pale skin, colorless eyes that can be completely white or completely black, and white or silver-white hair.
The D&D 65% Rule is a guideline suggesting player characters (PCs) should hit about 65% of the time against monsters with a Challenge Rating (CR) equal to their level, serving as a baseline for encounter balance, though many DMs find it overly simplistic and often ignore it due to the DMG's monster stats being inconsistent and its assumptions not always matching actual play. It comes from analyzing the Dungeon Master's Guide (DMG) monster stats, which show monster Armor Class (AC) often aligns with a ~65% hit chance for standard attacks, but this isn't always accurate for real monsters.
Unlike ponies, changelings do not have cutie marks. Following their metamorphosis in To Where and Back Again - Part 2, changelings have varied coat colors and insect characteristics, such as Thorax and Pharynx's horns, and they no longer have fangs or holes in their bodies.
Changelings are a race of insect-like equines in Equestria that first appear in A Canterlot Wedding - Part 2 as the minions of the episode's antagonist, Queen Chrysalis. Able to feed off love and take the shape of other lifeforms, Changelings have been depicted in both a positive and negative light within fan works.
Absolutely. The whole changeling thing that they were vulnerable to "cold iron" (cold iron and regular iron are two completely separate things) was something from an entirety separate game system based on also on some traditional Celtic lore.)
While a changeling can adjust its color and texture to virtually any combination, and its height and weight to a significant amount, it cannot grow hair or change the shape of its eyes.
However, most Psy do have a metallic stink.
No. An alicorn is a pony with the traits of all three tribes. Changelings are a different species, aka not ponies.
Powers & Abilities
In their human forms, the Changelings also appear to be immune to the effect of sunlight just like Stalklings, thus making them the perfect spies for the Gumm-Gumms. Some of them, like Stricklander and Nomura, are accomplished warriors.
46,XY pure gonadal dysgenesis (Swyer syndrome) is characterized by normal female genitalia at birth. It usually first becomes apparent in adolescence with delayed puberty and amenorrhea. Rarely, patients can present with spontaneous breast development and/or menstruation.
In Changeling: The Dreaming, Changelings as well as True Fae are weak to cold iron, in the mechanics of the game, cold iron does "aggravated" damage to Changelings and True Fae, meaning it cannot be healed with any supernatural means or accelerated healing powers.
Changelings mature slightly faster than humans but share a similar lifespan—typically a century or less. While a changeling can transform to conceal their age, the effects of aging affect them similarly to humans.
Many people who are intersex can get pregnant. While people who are intersex may have differences in their anatomy, chromosomes, and/or hormones that can impact their ability to get pregnant, many intersex people have ovaries and/or testes that can produce eggs or sperm, which can lead to a pregnancy.
Elephants have the longest gestation period of all mammals, carrying their young for 18 to 22 months before giving birth.
The Traveler is the patron of all those who welcome change, in body and in philosophy. Its worshipers include changelings, shifters, doppelgangers, and lycanthropes, who see it as the greatest of gods, but only doppelgangers and lycanthropes routinely revere it.