Concealing Baby Swallow
The Concealing Baby Swallow is a four-candle bullish reversal pattern that appears during a downtrend — and it's one of the rarest candlestick patterns you'll encounter. What makes it unusual is that all four candles are bearish, yet the pattern signals a potential reversal to the upside. Candles 1 and 2 are strong bearish marubozu-like candles (little or no shadows). Candle 3 gaps down from candle 2's close, but its upper wick penetrates back into candle 2's body — showing early signs of buying pressure. Candle 4 then opens at or above candle 3's high and closes at or below candle 3's low, fully engulfing candle 3 including its shadows. This engulfing action on the final candle suggests sellers are exhausted and a reversal may follow.
Concealing Baby Swallow candlestick pattern diagram
Pattern Anatomy
- Candle 1: A strong bearish marubozu — little or no upper/lower shadows, showing uninterrupted selling pressure
- Candle 2: Another strong bearish marubozu — sellers remain firmly in control with minimal shadows
- Candle 3: Bearish, gaps down from candle 2's close, but its upper wick (high) penetrates back into candle 2's body — the first sign of buying interest
- Candle 4: Bearish, opens at or above candle 3's high and closes at or below candle 3's low — fully engulfing candle 3 including its shadows
- Must occur in an established downtrend to be considered a valid reversal signal
How to Interpret
- Despite consisting entirely of bearish candles, this is a bullish reversal signal — the structure reveals selling exhaustion beneath the surface
- The engulfing action on candle 4 suggests that although sellers drove the price lower, they could not sustain momentum — buyers are stepping in
- Extremely rare — most traders will never see a textbook Concealing Baby Swallow in live trading
- Best confirmed with a volume increase on candle 4, signaling conviction behind the exhaustion move
- A highly-ranked pattern in Engulfy — high priority when detected due to rarity and reversal significance
How Engulfy Detects the Concealing Baby Swallow
- All four candles must be bearish (Close < Open)
- Candles 1 and 2 must be close-to-marubozu (minimal shadows, marubozu-like)
- Candle 3 must gap down: Open < Candle 2 Close
- Candle 3 high must penetrate Candle 2 body: High > min(c2.Open, c2.Close) AND High < max(c2.Open, c2.Close)
- Candle 4 must fully engulf Candle 3 including shadows: Open ≥ c3.High AND Close ≤ c3.Low
Engulfy uses carefully tuned detection criteria based on established charting literature, with calibrated thresholds for marubozu identification and engulfment requirements.
Expert References
- Steve Nison, Japanese Candlestick Charting Techniques — originally documented the Concealing Baby Swallow as a bullish reversal pattern. Nison's definition is more forgiving on the marubozu requirements for candles 1 and 2, focusing more on the overall structure.
- Thomas Bulkowski, Encyclopedia of Candlestick Charts — notes the extreme rarity of the pattern and applies stricter criteria, requiring near-perfect marubozu candles for the first two positions and full shadow engulfment on candle 4.
- A highly-ranked pattern in Engulfy — reflects high significance when detected, balanced by the pattern's extreme rarity.
Controversy & Limitations
- The pattern's extreme rarity makes backtesting very difficult — there simply aren't enough historical samples to draw strong statistical conclusions
- The strict marubozu requirement for candles 1 and 2 filters out the vast majority of potential candidates, which is why Engulfy uses calibrated criteria for detection
- Different sources disagree on exact requirements — Nison is more lenient on body sizes while Bulkowski demands near-perfect marubozu and full shadow engulfment, leading to inconsistent detection across platforms