@XDownwiththissortofthingX yes I think I agree with you. The numbers don't tally with our current understanding of prevalence and risk.
There were 53,000 babies born in Scotland in 2000. but we're talking a four year period so say 212000 so far as I can see the best estimate we have for the proportion of mums (in the uk) who are subjected to IPV during pregnancy is 3.4% So over the 4 year period that would give 7208 (say a range 7000 - 7500) babies born to mothers who had been subjected to ipv during the pregnancy.
Which, in terms of the order of magnitude, is the same as the tweet suggests for the number of women beaten so badly they lost the baby. So this would suggest that either rates of IPV are underestimated by about half and women experiencing IPV were at a 50% risk of losing the baby or rates of IPV in pregnancy were underestimated by a whopping 10x and the risk of miscarriage in women experiencing IPV was around 10% in line with the Guatemalan women from the study below. OR the tweeter has misunderstood the statistics they got from the police.
I'd suspect the tweet is the most likely to be wrong and as XDown suggests the number of callouts the police went to involving pregnant women has been conflated with them all being to separate women who all lost the baby. I'll be honest I want the statistic to be wrong, but sometimes that's it goes, you find a piece of data that just really doesn't fit your understanding and have to change your understanding to fit the data. I won't be doing that on the basis of this one tweet though.
Number of births in Scotland data
https://www.nrscotland.gov.uk/files/statistics/rgar/2019/Pages/bir-sec.html#:~:text=Births%20up%20to%202019,1900%20to%2053%2C000%20in%202000.
3.4% figure (whole uk) from this paper - Bacchus, Loraine, Gill Mezey, Susan Bewley, and Alison Haworth. "Prevalence of domestic violence when midwives routinely enquire in pregnancy." BJOG: An International Journal of Obstetrics & Gynaecology 111.5 (2004): 441-45. Web. 22 Mar 2011
This study may be relevant "IPV affected 18% of the 1897 pregnant Guatemalan women aged 15-47 in this sample. Verbal IPV was most common (16%), followed by physical (10%) and sexual (3%) victimisation. Different forms of IPV were often co-prevalent. Miscarriage was experienced by 10% of the sample (n = 190). After adjustment for potentially confounding factors, physical or sexual victimisation by a male intimate partner in the last 12 months was significantly associated with miscarriage (ORadj 1.1 to 2.8). Results were robust under a range of analytic assumptions."
https://bmcpregnancychildbirth.biomedcentral.com/articles/10.1186/1471-2393-11-49