Lucy Letby worked two placements at Liverpool Women's Hospital in 2012 and 2015.
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Babies' breathing tubes were dislodged at an unusual rate during Lucy Letby's placements at Liverpool Women's Hospital, the public inquiry into her crimes has heard.
"This is not something that is happening all the time", he said.
"It is unusual, and you will hear that it occurs generally in less than 1% of shifts."
The audit found that there were recorded incidents of the tubes being dislodged on 40% of the shifts Letby worked at Liverpool Womens' Hospital.
Mr Baker said: "In light of what we know now, we might wonder why.”