The clinical context
Baby M was a preterm twin. He survived. The Crown’s case alleged attempted murder by the same air-embolism mechanism advanced on several other counts.
The prosecution theory
The Crown argued that Letby had injected air into Baby M’s venous line, producing a sudden deterioration from which the baby was successfully resuscitated.
What independent specialists read from the same record
- Skin signs do not match Lee 1989. As with the other air-embolism counts, the skin descriptions at Baby M’s deterioration do not meet the diagnostic specificity of the Lee & Tanswell 1989 paper’s criteria. See our air-embolism line-by-line analysis.
- Twin-pregnancy baseline instability. A preterm twin with a central venous catheter is at elevated risk of sudden deterioration from natural causes including thrombosis, circulatory collapse, and respiratory instability. See our twins and multiples deep-dive.
- Successful resuscitation is evidence of a non-catastrophic mechanism. A full-dose deliberate air embolism would normally be expected to produce an unrecoverable event. Baby M’s successful recovery is consistent with a less catastrophic natural deterioration than the Crown’s theory required.
- No post-mortem confirmation available. Baby M survived, so no pathological confirmation of air embolism is available. The theory rests on clinical signs — the same signs Dr Shoo Lee himself says do not meet his 1989 paper’s criteria.
The pattern dependence
The conviction on Baby M was argued to the jury in the context of the wider air-embolism pattern. Baby A, Baby C, Baby D, Baby E, Baby I, Baby O, Baby P. If the air-embolism pattern is not sustained on the underlying cases, the attempted-murder conviction on Baby M rests on a foundation of other convictions that independent review does not support.