<h1 id="pony-pregnancy-pregnancy-and-postpartum-anatomy-model-nsfw-and-sfw">Pony Pregnancy — Pregnancy &amp; Postpartum Anatomy Model NSFW &amp; SFW</h1>A fine-tuned Pony checkpoint focused on pregnancy and postpartum abdominal morphology. It’s designed for clinical/realistic depiction (not stylized anime) with expressive tagging to control the shape and features of the stomach. In addition, postpartum conditions are captured for a consistent before, during and after transition, which includes wrinkling, overhang, diastasis, popped navels etc.<h3 id="what's-new-in-v1.0">What's new in v1.0?</h3>The latest release is much improved on overall visual fidelity and responsiveness to prompts. There are also a lot more images in the data set non-pregnancy related which helps to ensure concepts are not lost or overridden if they aren't well represented in available pregnancy imagery.<h2 id="key-tags">✅ Key Tags</h2><h3 id="important">Important</h3>Phase-locked mandatory control with two anchors:<ul><li><code>phase_pregnant</code> - use to generate pregnancy material</li><li><code>phase_postpartum</code> - use to generate postpartum material</li></ul>Ethnicity<ul><li><code>chinese</code> ,<code>european</code> - more refinement to come</li></ul><h3 id="pregnancy">Pregnancy</h3><ul><li>Trimester control with:<ul><li><code>first_trimester</code>, <code>second_trimester</code>, <code>third_trimester</code><ul><li>Tip: control overall size with more refinement by weighting phase_pregnant between ~0.5 - 1.0</li></ul></li></ul></li><li>Textural control with:<ul><li><code>gigantic belly</code></li><li><code>stretch marks</code></li><li><code>flat navel</code></li><li><code>slit navel</code></li><li><code>deep navel</code></li><li><code>outie navel / huge outie navel</code></li><li><code>linea alba / hyperpigmentation</code></li></ul></li><li>Expanded Attire control with:<ul><li><code>shirt overhang</code></li><li><code>dress overhang</code></li></ul></li></ul><h3 id="postpartum">Postpartum</h3><ul><li>Postpartum taxonomy for nuanced outcomes:<ul><li><code>pp_deep_creases</code> - heavy wrinkling</li><li><code>pp_crepey_skin</code> - subtle loose skin, noticeable affected skin texture</li><li><code>pp_panniculus</code>- belly apron, skin that hangs and folds over the groin area</li><li><code>pp_hidden_navel</code>- navel occluded by loose skin folding over</li><li><code>pp_frowning_navel</code> - downturned/hooded look</li><li><code>pp_flat_navel</code>- navel that didn't return to an innie and is flat along the stomach</li><li><code>pp_diastasis_recti</code> - ab separation causing a soft squishy belly</li><li><code>pp_dr_mild/moderate/severe</code>- severity of the ab separation</li><li><code>stretch marks</code> - future improvement will differentiate between fresh stretch marks and faded out ones</li></ul></li></ul><h2 id="recommended-settings">📸 Recommended Settings</h2><ul><li>Sampler: DPM++ 3M Karras / Euler a<ul><li>Each has slightly different characteristics, use your personal preference</li><li>With Forge, I have found DPM++ 3M to give the most realistic appearance and skin texture, but does add a bit of fuzz like you'd get from amateur photography (as is most of the dataset out of my control). Euler a will give you sharper results, but slightly less realistic</li></ul></li><li>Steps: 25–35 (Euler a) · 28–40 (DPM++ family)</li><li>CFG: 4.5–6.5</li><li>Resolution: 1024×1024 (train res), or 832×1216 / 1216×832 if composing full height</li><li>Hires fix / Upscale: optional 1.2–1.6× with a gentle denoise (0.2–0.35) to sharpen textures</li></ul>Working with niche characters?You can a LoRA of the character you want to generate, and if from an anime source, set to a CLIP strength of 0.5. You'll still capture their details decently, pairing with (big eyes) in negative prompt to stay grounded in reality.<h2 id="prompt-guidelines">🧩 Prompt Guidelines</h2>Captioning rules:<ul><li>Prefix every pregnancy prompt with: <code>phase_pregnant, trimester_X, X navel, ethnicity ...</code></li><li>Prefix every postpartum prompt with: <code>phase_postpartum, pp_X, pp_Y, ethnicity ...</code></li></ul>Note: Existing <code>pregnant</code> tag is unnecessary.Belly size:The belly size is very flexible, but takes a little bit of tweaking to get it perfect. As mentioned above, you can control overall size with more refinement by weighting phase_pregnant between ~0.5 - 1.0 in the prompt. First trimester in some cases may still show a larger belly, but you can reduce it with the phase reduction.As an experiment, I found that <code>gigantic belly</code> gives much larger pregnant bellies than what is currently in the dataset with realistic properties still retained. Try this for triplet + bellies.Please also check out the metadata of the images provided above on this model.<h3 id="why-not-a-lora">Why not a LoRA?</h3>I chose a full Pony fine-tune instead of a LoRA because the goal was precise, clinical anatomy without fighting the base model’s priors.<ul><li>Fidelity over flexibility. LoRA’s low-rank adapters are great for styles/characters &amp; concepts, but they often miss fine-grained surface detail (wrinkling, creasing, skin pigmentation, navel nuances) unless you crank ranks/weights—and even then textures can “mush” under different seeds/resolutions with oversaturation. Full fine-tune lets the UNet itself learn these micro-features.</li><li>Avoiding anime-like priors. Many base checkpoints implicitly learn idealized or stylized (often anime-skewed) pregnancy shapes from the internet. A LoRA tends to add a direction on top of that, so you end up battling the base with weights/negatives. Full fine-tune rewrites those priors so realistic pregnancy/postpartum anatomy is the default when you use the phase tokens.</li><li>Trade-offs (accepted). Yes, a full model is larger and costlier to train than a LoRA, and it’s less “plug-and-play” with other adapters. But for this use case—accurate, phase-specific abdominal anatomy—the consistency and detail were worth it.</li></ul>

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