Seemantham
Muhurth is fixed in 2 steps shown as 2 rules tables below.
Simantonayana or parting of wife's hair by husband also purifies the fetus. This ceremony is performed by the husband for the wife to protect her from evil spirits and from ill health during the pregnancy. This Sanskar is performed during the seventh month of pregnancy and prayers are offered for the healthy physical and mental growth of the child. The other importance of this Sanskar is to free the expectant mother free from worries since the last 3 months are very difficult for pregnant woman -- both physically and mentally. On the day of this Sanskar, the expectant mother gets food of her desire. Only women are invited for this ritual and the gathering is kept small The husband performs this ritual.
Rules Table I
| No. | Good | Avoid |
| 1 | Nak = 2nd and 3rd paad of -- Mrgasiras. Pusya, Hast, Uttara, Uttarashada, Uttarabhadrapad, rohini, revati, mula, punarvasu or shravan. | Nak = Asvini, Punartham, Pooyam, Attham, Anisham, Thiruvonam, Poorottathi, Uttrattathi |
| 2 | Day = Su Mo Tu We Th Fr | Sa [Tu in South India] |
| 3 | Tithi = 5,7,10,11,13
[16,17,18,19,20]
In emergency Tithi = 4/8/14/9/6/12 |
4,9,14,
amavasya, and S8 1st half of K7, S1 and P15 2nd half of K3,K10 and S11 Krishna Paksham full Tithi = 1,2,3,4,8,6,9,12,14,15,21 to 30. |
Rules Table II
| No. | Good | Avoid |
| 4 | Shubh Grahas in 1,4,7,10 and 5,9. | Ascendant = Simham, Vrichikam |
| 5 | Papa Grahas in 3,6,11 | Sayanham. Madhyanham first 10 g |
| 6 | Male adhipathi for Lagna and NavamshaLagna | Single planet in 8th |
| 7 | 6th
or 8th month of pregnancy. some say 4/5/7/9th month. |
Lag in 8th from wife's lagna and rasi |
| 8 | Moo in 12/6/8 | |
| 9 | Ulka = Eclipse day. Earthquake day. Meteor Shower day. Animal howling day. |