Low birth weight PSM

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Low Birth Weight (LBW) — PSM Perspective

1. Definition & Classification

Term	Birth Weight
Low Birth Weight (LBW)	< 2500 g (< 2.5 kg)
Very Low Birth Weight (VLBW)	< 1500 g
Extremely Low Birth Weight (ELBW)	< 1000 g

WHO defines LBW as a birth weight of less than 2500 g, irrespective of gestational age.

By gestational age:

Preterm (< 37 weeks) — premature delivery
Term/Post-term with LBW — due to Intrauterine Growth Restriction (IUGR)

By size for gestational age:

Small for Gestational Age (SGA): < 10th percentile
Large for Gestational Age (LGA): > 90th percentile
Appropriate for Gestational Age (AGA): 10th–90th percentile

2. Magnitude of the Problem

LBW is one of the leading causes of neonatal and infant mortality and morbidity worldwide
India has one of the highest rates globally (~28%) — compared to <7% in developed countries
Contributes significantly to neonatal deaths, developmental delays, and chronic diseases in adulthood (cardiovascular disease, hypertension, CKD — the "Barker hypothesis")

3. Causes / Determinants

LBW is multifactorial and operates through two pathways: preterm birth and IUGR.

A. Maternal Factors (Most Important)

Category	Factors
Nutritional	Maternal underweight (pre-pregnancy BMI <18.5), short stature, iron/folate deficiency, poor weight gain during pregnancy
Age	Teenage mothers (< 17 yrs), elderly primigravida (> 34 yrs)
Obstetric history	Grand multiparity, previous LBW/preterm infant, short interpregnancy interval (<6 months), previous abortions
Medical conditions	Anaemia, hypertension, diabetes, renal disease, hypothyroidism, UTI/bacteriuria, TORCH infections
Pregnancy complications	Pre-eclampsia/eclampsia, APH, multiple pregnancy (twins/triplets), placenta previa, abruptio placentae, polyhydramnios
Lifestyle/toxic	Smoking (doubles LBW risk), alcohol, drug abuse, excessive physical stress, occupational hazards
Psychosocial	Severe psychological stress, domestic violence

B. Socioeconomic & Environmental Factors

Low socioeconomic status — most powerful social determinant
Low level of education / illiteracy
Poor/absent antenatal care (ANC)
Rural residence, poor access to health services
Hard physical labour during pregnancy
Exposure to environmental toxins, infections

C. Fetal Factors

Chromosomal/congenital anomalies
Congenital infections (TORCH: Toxoplasma, Rubella, CMV, HSV)
Multiple gestation

D. Placental Factors

Placental insufficiency/infarcts
Abruptio placentae
Placenta previa
Umbilical cord prolapse

4. Consequences of LBW

Immediate (Perinatal/Neonatal)

Asphyxia at birth
Hypothermia (poor thermoregulation)
Hypoglycaemia
Respiratory Distress Syndrome (RDS)
Infections/sepsis (immature immunity)
Necrotizing enterocolitis (NEC)
Intraventricular haemorrhage (IVH)
Higher infant mortality (LBW babies account for ~80% of neonatal deaths)

Long-term

Impaired cognitive development, poor school performance
Barker hypothesis (Fetal Origins of Adult Disease): LBW → ↑ risk of hypertension, type 2 diabetes, coronary artery disease, stroke, CKD in adult life
Accelerated renal ageing (reduced nephron number → hyperfiltration → CKD)
Short stature, poor immune function

5. Prevention & Control

A. Preconceptional

Improve maternal nutrition before pregnancy (weight gain, iron/folate supplementation)
Space pregnancies — ≥2-year interpregnancy interval
Treat chronic diseases (HTN, DM, anaemia)
Smoking cessation counselling
Rubella immunisation
Delay first pregnancy past adolescence

B. During Pregnancy (ANC-based)

Early and regular ANC (minimum 4 visits — WHO; 8+ visits — updated WHO 2016)
Nutritional supplementation: Iron + Folic acid (IFA), calcium, protein supplements
Detection and treatment of bacteriuria, anaemia, PIH, diabetes
Avoid hard physical labour
TT immunisation
Management of multiple pregnancy
Cervical cerclage for cervical incompetence
Progesterone supplementation in high-risk women

C. At Delivery

Skilled birth attendance
Referral of high-risk cases to FRUs/hospitals
Avoidance of iatrogenic prematurity (unnecessary early induction)

D. Postnatal Care of LBW Baby

Kangaroo Mother Care (KMC): Skin-to-skin contact — the single most important intervention; maintains warmth, promotes breastfeeding, reduces mortality
Exclusive breastfeeding (or expressed breast milk)
Prevention and treatment of hypothermia, hypoglycaemia, infections
Careful monitoring of weight gain

6. National Programmes Addressing LBW (India)

Programme	Relevance
PMSMA (Pradhan Mantri Surakshit Matritva Abhiyan)	Free ANC for high-risk pregnant women on 9th of every month
Janani Suraksha Yojana (JSY)	Cash incentive for institutional delivery
JSSK (Janani Shishu Suraksha Karyakram)	Free maternity and newborn care
POSHAN Abhiyan	Nutrition supplementation — targets maternal undernutrition
RBSK (Rashtriya Bal Swasthya Karyakram)	Child health screening including LBW babies
NHM / IMNCI	Integrated management of neonatal/childhood illness
Navjaat Shishu Suraksha Karyakram (NSSK)	Training in basic newborn care including LBW management

7. Key PSM Points to Remember

Point	Detail
Cut-off	< 2500 g
Most common cause in developing countries	IUGR (chronic maternal malnutrition + infections)
Most common cause in developed countries	Preterm birth
Single most preventable cause	Maternal smoking
Best postnatal intervention	Kangaroo Mother Care (KMC)
Barker hypothesis	LBW → adult non-communicable diseases
India's LBW rate	~28% (among highest globally)
WHO minimum ANC visits	8 contacts (2016 guidelines)

Sources: Brenner and Rector's The Kidney; Kaplan & Sadock's Comprehensive Textbook of Psychiatry; National Institute for Health (NBK214456); Textbook of Family Medicine (9e) — supplemented with standard PSM/community medicine curriculum content (Park's Textbook of Preventive & Social Medicine framework).

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