Bottom Growth on T: Timeline, Changes & FTM Pumping Guide
Bottom growth is clitoral tissue growth caused by testosterone. It can begin in the first months of T, but timing, size, and sensation differ from person to person.
The short version. Most people notice bottom growth 3 to 6 months into testosterone. Typical growth is 1 to 4 cm over 1 to 3 years. A pump brings blood into the tissue during a session; the Deluxe and Pro are built for exactly that.
This guide covers what testosterone changes, what an FTM pump does during a session, and when to involve your clinician. Educational information, not medical advice.
What is bottom growth?
Bottom growth is the enlargement of clitoral tissue that testosterone causes. In community language it is your t-dick.
It is a standard effect of T, alongside voice change and body hair, and it happens whether or not you do anything to encourage it. The community word for it is covered in what t-dick means.
When does bottom growth start on T?
FOLX Health puts typical onset at 3–6 months after starting testosterone. Some people notice something in the first weeks. Some wait past the six-month mark.
Years one through three are where most of it happens. That surprises people who expect the first six months to do the heavy lifting. It is a years-long process, and the pace is set by your body, your dose, and your genetics.
Low-dose testosterone still typically produces some bottom growth. Microdosing changes the timeline more reliably than it changes the destination. That is a dose conversation for your prescriber.
| When | What many people notice |
|---|---|
| First weeks | More sensitivity, sometimes tenderness; erections easier to notice |
| 1 to 6 months | Visible growth begins |
| 6 to 12 months | Length and girth keep increasing |
| 1 to 2 years | Growth slows; most of it is in |
| Year 3 and on | Small changes still possible |
How much growth is typical?
Typical bottom growth on testosterone is 1–4 cm. Studies report averages between 2.5 and 4.6 cm, per FOLX Health.
Those figures describe populations rather than individuals. To track your own, see how to measure bottom growth.
The first months are often uncomfortable
Early bottom growth commonly brings hypersensitivity: pressure, itching, burning, sensitivity against underwear, and erections that arrive on their own schedule. FOLX Health notes this usually resolves by around six months.
Softer fabrics. Roomier cuts. Lube or moisturiser. Less packing time while things are most reactive. That handles most of it.
What does an FTM pump actually do?
A pump creates a vacuum. Blood moves into the tissue under it. During the session the tissue expands past the size it normally sits at, and afterward you get engorgement, warmth, and for most people heightened sensation.
Those are session effects. They happen on your first session and they happen whether or not you are on T. FOLX Health covers pumping in both pre-T and on-T contexts and calls our Trans Masc Pump "easy and effective."
People pump for the sensation, for the visual through the cylinder, and for the ritual of spending time with their own anatomy on purpose.
A number of surgeons ask for pumping on both sides of metoidioplasty, to support circulation. If surgery is on your horizon, raise it with your surgical team. Planning for surgery: pumping around metoidioplasty.
Which pump should you start with?
Two pumps. Both use cylinders shaped for bottom-growth anatomy, with silicone comfort cushions, ruler stickers, and a gauge so you can see your pressure as a number. Both work pre-T and on T.
- Trans Masc Pump Deluxe, Gauge Edition. Manual: press and pump. Digital gauge, quick-release valve on the handle, three cylinders with removable comfort cushions, ruler stickers. $79.99. Built for starting out and partner play. In stock.
- Trans Masc Pro Pump. Rechargeable, 60-minute charge, 60-minute run. Digital gauge, manual, automatic and blow job modes, quick release, shower safe. Same three cylinders and cushions. $129.99. Built for more power and more levels.
Cylinder sizes, both pumps: 1" x 2", 1.3" x 3", 1.5" x 4.5". The Pump 2.0 evolved into the Deluxe.
Each comes as a kit with the Jack stroker: Deluxe + Jack $129.99 (save $29.99 versus the Deluxe regular price of $99.99 plus Jack at $59.99 ($159.98 total)) and Pro + Jack $159.99.
Every piece carries a One-Year Maker's Warranty. Side by side: the pump comparison chart. Everything ships in a plain box with no branding on the outside.
How do you pump safely?
Warm up first. Warm water on the pump, a warm towel on you. Dry everything, then lube both yourself and the cylinder rim. Lubricant directly reduces discomfort.
Start at low pressure. Your first sessions run 5–10 minutes and stop there. Never exceed 30–45 minutes, cap it at 4–5 sessions a week, and never more than 3 in a day.
Beginners start low: about 100 to 150 mbar on the Deluxe gauge, 10 to 15 kPa on the Pro (the gauge chart converts between units). If your tissue reaches the end of the cylinder, size up.
Pain means stop. The full walkthrough is at how to pump for bottom growth, step by step.
Is bottom growth permanent?
Generally, yes. FOLX Health describes it as a permanent change: once the tissue grows on testosterone, it typically stays, even if you stop T later. Same category as voice deepening.
There are anecdotal reports of partial reversal in people who were on T briefly or at low doses. Those are individual accounts, not studies. If reversibility matters to your decision, the full discussion is at is bottom growth permanent.
Frequently asked questions
What is bottom growth?
Clitoral growth caused by testosterone, commonly called a t-dick. Typical growth is 1–4 cm with study averages of 2.5–4.6 cm, per FOLX Health, and it usually begins 3–6 months into T.
When does bottom growth start on testosterone?
Usually 3–6 months in, per FOLX Health. Most of it arrives during the first three years. Some people notice sensation changes in the first weeks; others notice nothing for months.
What does an FTM pump do?
It brings blood into the tissue during a session. The tissue expands beyond its everyday size while you use it, and you get engorgement, warmth and heightened sensation. It works from the first session, on T or pre-T.
Can you pump before starting T?
Yes. The mechanics of a pump work the same with or without T, and FOLX Health covers pumping pre-T and on-T. Our cylinders work at either stage.
Is bottom growth permanent?
Per FOLX Health, generally yes, and it typically remains after stopping testosterone. Anecdotal reports of partial reversal exist for short-term or low-dose T.
How big does bottom growth get?
Typical growth is 1–4 cm, with studies reporting averages of 2.5–4.6 cm, per FOLX Health. Everyone's range is their own.
More pump and bottom-growth guides
- How to pump for bottom growth: steps, pressure and time
- FTM pump comparison: Deluxe vs Pro
- Bottom growth before and after
- How to measure bottom growth
- Pump gauge chart: mbar, kPa and inHg
- Is bottom growth permanent?
- What t-dick means
- Pumping around metoidioplasty
- DHT cream for bottom growth
- Microdosing T and bottom growth
- Pump troubleshooting
