https://x.com/anishmoonka/status/2100502520632320436?s=20
Part 2. Rough-and-tumble play makes children more aggressive, but only when the father stops running the game. A 2009 study filmed 85 children aged 2 to 6 wrestling with their fathers at home, then rated how much each father controlled the play. The results split cleanly along that line. Children whose fathers ranked low on dominance during play were more physically aggressive, and the more they played, the worse it got. In the families where the father stayed in charge, frequent rough play carried no such cost. How often they played predicted nothing on its own. Who was steering predicted almost all of it. A dominant playmate here is the father who sets the pace, calls the stop, decides when the game has tipped over, and lets the child win on purpose. He is running the thermostat. Take him out of that role and the wrestling match becomes two children on the floor, where the child learns that escalation works. A 2017 review pooled 16 studies covering 1,521 father-child pairs and found the same pattern in weaker form. Father-child physical play was linked to aggression, social competence, emotional skills and self-regulation, with effects ranging from weak to moderate. The authors were blunt about why the numbers stay small. Most studies counted how often families played. Almost none measured how well. Counting hours is easy, and quality is the part that decides the outcome. So the floor time is the entry fee. Reading the child while you are down there, catching the moment the laughing turns to panic, and stopping it before it arrives is the actual work. pubmed.ncbi.nlm.nih.gov/19431190/
Part 3. Fathers who push their children to the edge of what they can handle have children with less social anxiety. Mothers who do the same thing have children with more. A Dutch study observed 94 families with their 2- and 4-year-olds, coded the behaviour, and found the split going in opposite directions. Researchers call it challenging parenting behaviour: playfully daring a child past their comfort zone. Throwing them higher than they expected. Tickling past the point they asked you to stop. Encouraging the jump from the wall that looks slightly too high. Fathers who did more of this had 4-year-olds who showed less social anxiety with a stranger six months later. Mothers who did more of it had 4-year-olds who showed more. Neither pattern appeared for the 2-year-olds, and neither appeared in how parents rated their own children, which only tracked their earlier ratings. Trained observers caught the effect while the parent questionnaires missed it completely. Follow those children forward and the pattern holds. A 2019 analysis of 476 families tracked from infancy found that father-child play quality in first grade predicted fewer emotional regulation problems by third grade, and those children reported fewer anxiety and depression symptoms at 15. Mothers' ratings of the same children did not carry the chain. A German study followed 44 families for 16 years and found that fathers' sensitive, challenging play in toddlerhood predicted how their children thought about relationships at 10 and at 16. For the teenagers, fathers' play quality was the only thing that predicted it. Forty-four families is a small group, and observed anxiety in a lab is a narrow measure. The direction is consistent across three separate teams, though, and the mechanism is the same one every time. A child learns that big feelings are survivable by having them in a safe place with someone who has done it before. pubmed.ncbi.nlm.nih.gov/23812638/
Part 4. Becoming a father cuts a man's testosterone by about a quarter, and the men doing the most hands-on care drop the furthest. Researchers tracked 624 men in the Philippines from age 21, before any of them had children, and measured their hormones again four and a half years later. Men with high morning testosterone at the start were more likely to become partnered fathers by follow-up. Once they did, their morning testosterone fell by a median of 26 percent and their evening levels by 34 percent, far steeper than the drop in men who stayed single and childless. Fathers putting in three or more hours of daily childcare had the lowest levels of all. A 2014 study scanned 89 parents caring for their firstborn and found a single caregiving network running across mothers and fathers alike. In fathers raising infants with no mother involved, the emotional alarm centre and the region that reads other people's intentions were firing together, the same signature primary-caregiving mothers showed. Across every father in the study, the strength of that connection tracked the hours spent in direct childcare. That same window carries a cost few men are warned about. A meta-analysis of 43 studies covering 28,004 people put depression in fathers at 10.4 percent across pregnancy and the first year, rising to 25.6 percent between three and six months after the birth. Roughly one father in four struggles in that specific stretch. A UK study of 8,431 fathers found that depression in the weeks after birth doubled the odds of emotional and behavioural problems in their children at 3.5 years, and boys were at 2.7 times the odds of conduct problems. Those effects held after accounting for the mother's depression and the father's later depression. A man's body changes to prepare him for this. Nobody tells him that, and the silence in that window costs his children something measurable. pubmed.ncbi.nlm.nih.gov/21911391/
Part 5. How often a separated father sees his children predicts almost nothing about how they turn out. Researchers pooled 63 studies. Contact frequency came back unrelated to child outcomes in general, while what he actually did during those hours was related to every one of them. Children who felt close to their fathers did better academically and had fewer behavioural and emotional problems. So did children whose fathers parented authoritatively, meaning warm and firm at the same time, holding the line without going cold. Paying child support showed up as positive too. Turning up did not, on its own. A study of 1,116 twin pairs sharpened the point further. The less time fathers spent living with their children, the more conduct problems those children had, which is the finding everyone expects. It reversed for one group. Where fathers scored high on antisocial behaviour, more time living together produced more conduct problems. The authors described those children as receiving a double dose of risk, genetic and environmental. A meta-analysis covering 160,927 children tested 17 outcomes and found spanking linked to worse results on 13 of them. It was linked to better results on zero. Cowan and colleagues ran the version of this that matters most, a randomised trial of 289 low-income families followed for 18 months. Fathers assigned to a 16-week group became more engaged with their children, and those children had fewer behaviour problems. The families assigned to a 16-week couples group did better still, and their gains lasted longer. Strengthening the parents' relationship moved the father more than coaching the father alone did. pubmed.ncbi.nlm.nih.gov/12625439/
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