Review for 10.1186/s12876-020-1182-y (2020)

Reviewer’s report
Title: Intake of dairy protein during pregnancy in IBD and risk of SGA in a Norwegian
population-based Mother and Child cohort
Version: 1 Date: 03 Nov 2019
Reviewer: Jimil Shah
Reviewer's report:
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My Comments
1. Results of this study is very unique: Low PPDS is associated with higher risk of GWG, however,
lower risk of SGA. Do authors have any explanation for this discrepancy. 
2. In revised manuscript, authors have removed effect of disease activity of IBD on PPDS, however, in
background section it is still mentioned there (point no IV)
3. In table 3, 4 and 5, authors have classified PPDS groups in group 1,2 and 3. However, they have not
provided any description of classification of these groups in methodology
4. This study has major limitations in its methodology like 'recall bias' in obtaining dietary information,
lack of information regarding disease activity which can also influence the GWG or SGA, use of drugs
for IBD during that period which can also influence the GWG or SGA. 
Are the methods appropriate and well described?
If not, please specify what is required in your comments to the authors.
Yes
Does the work include the necessary controls?
If not, please specify which controls are required in your comments to the authors.
Yes
Are the conclusions drawn adequately supported by the data shown?
If not, please explain in your comments to the authors.
Yes
Are you able to assess any statistics in the manuscript or would you recommend an
additional statistical review?
If an additional statistical review is recommended, please specify what aspects require further
assessment in your comments to the editors.
I am able to assess the statistics
Quality of written English
Please indicate the quality of language in the manuscript:
Needs some language corrections before being published
Declaration of competing interests
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