The single most reliable sign that a pig has finished giving birth is the passing of the afterbirth (placenta). Sows typically expel the placenta within four hours of delivering their last piglet, though it can happen in minutes or take up to 12 hours. Until that happens, you’re watching a combination of timing, behavior, and physical cues to judge whether more piglets are still on the way.
What Normal Farrowing Looks Like
Knowing what’s normal helps you spot when things are wrapping up. Modern sows average about 3.5 hours of active labor from the first piglet to the last, but there’s wide variation. Some sows finish in under an hour, while others take close to nine hours. Between each piglet, you can expect a gap of roughly 15 to 22 minutes. Those intervals tend to get longer toward the end of farrowing as the sow tires.
During active labor, the sow lies on her side and has visible contractions. She may vocalize, get up and reposition, or paddle her legs between deliveries. As long as piglets keep arriving within that roughly 20-minute window, labor is progressing normally.
Signs She’s Finished
No single sign tells the whole story. You want to see several of these together before you’re confident farrowing is complete:
- The afterbirth passes. This is the clearest confirmation. The placenta comes out as a mass of dark, reddish membranes, sometimes in pieces. Once it’s fully expelled, the sow is almost certainly done. In sows, a failure to pass the afterbirth often means there are still piglets retained inside the uterus.
- Contractions stop. The sow’s flank relaxes, and you no longer see the rhythmic tightening of her abdomen. Her breathing slows to a normal rate.
- She gets up or shifts position. A sow that’s truly done will often stand, drink water, eat, or reposition herself to let the piglets nurse. This shift from laboring to mothering behavior is a strong signal.
- She settles into nursing. A finished sow will lie on her side in a relaxed posture and begin letting piglets latch on without the restlessness of active labor.
- Her abdomen looks smaller. Compare the sow’s belly to how it looked before labor. If she still looks full, there may be more piglets inside.
How Long to Wait Before Worrying
The critical threshold is one hour. If more than 60 minutes pass between piglets and the sow still appears to have a full abdomen, something may be wrong. Normal intervals are 15 to 22 minutes, so a gap beyond an hour is a clear signal that the sow needs help or that labor has genuinely ended.
Before jumping to intervention, watch the sow carefully during that hour. If she’s calm, not straining, and seems to be settling in with her litter, she may simply be done. But if she’s still straining without producing a piglet, seems exhausted, or shows signs of distress like rapid breathing or an inability to rise, the situation calls for action.
When the Afterbirth Doesn’t Come
The afterbirth should pass within about four hours of the last piglet’s delivery. If it hasn’t appeared by then, don’t assume everything is fine. Retained placentas in sows are often contained entirely inside the uterus, so you won’t necessarily see membranes hanging from the vulva. A retained placenta frequently indicates retained piglets as well.
If you suspect the afterbirth is stuck, a veterinarian can administer a small dose of a hormone that stimulates uterine contractions, helping the sow expel both placental tissue and any remaining piglets. This should only be done after confirming there isn’t a piglet stuck in the birth canal, since forcing contractions around an obstructed piglet can injure both the sow and the piglet.
Checking the Birth Canal Manually
If you’re experienced with livestock and the sow has gone more than an hour without delivering, a manual check can tell you whether a piglet is stuck or the uterus is empty. This is sometimes called “sleeving” because you wear a long obstetric glove.
The process requires careful hygiene: clean the sow’s vulva thoroughly, trim your fingernails short, wash your arm with soap and water, put on a lubricated glove, and shape your hand into a cone before gently inserting it into the birth canal. You’ll feel the bony pelvis on the sides and bottom. Moving forward through the pelvis, you can reach into the uterus, which slopes downward and divides into two horns. If nothing is there, the sow is done.
Gentleness is essential. The tissues of the birth canal bruise and tear easily, and rough handling can cause swelling, hemorrhage, or serious infection. If you aren’t confident doing this, call a vet rather than risk injuring the sow.
What Normal Discharge Looks Like Afterward
Some vaginal discharge after farrowing is completely normal and doesn’t mean something went wrong. Healthy post-birth discharge is watery or slightly cloudy and can range from clear to whitish, yellowish, or reddish. It may continue for several days, with the heaviest flow typically appearing between day two and day four after birth. The volume can be surprisingly large.
What isn’t normal is discharge that’s foul-smelling, brown, or gray. These colors and odors suggest infection or decomposing tissue inside the uterus. Pair that with a body temperature above 39.5°C (103°F), lethargy, and loss of appetite, and the sow likely has a uterine infection that needs veterinary treatment.
Signs of Trouble During or After Farrowing
Keep an eye out for these red flags, which suggest the sow needs help rather than patience:
- Gestation past 116 days without labor starting
- Blood-tinged fluid or dark green/brown discharge leaking before any piglets arrive, especially without straining
- Straining hard without producing a piglet for more than 30 minutes
- Foul-smelling gray or brown discharge at any point
- Reddening of the eyes, which can indicate toxemia
- Exhaustion, rapid breathing, or inability to stand after prolonged labor
A sow that finishes farrowing normally will look tired but alert. She’ll drink water, show interest in food within a few hours, and actively nurse her piglets. That combination of a passed afterbirth, a calm and attentive sow, and a litter that’s nursing well is the best confirmation that farrowing is truly complete.